diff --git a/app/models/form/page.rb b/app/models/form/page.rb
index 3ee1932cc..5bf1e1618 100644
--- a/app/models/form/page.rb
+++ b/app/models/form/page.rb
@@ -1,5 +1,5 @@
 class Form::Page
-  attr_accessor :id, :header, :description, :questions, :depends_on, :title_text,
+  attr_accessor :id, :header, :header_partial, :description, :questions, :depends_on, :title_text,
                 :informative_text, :subsection, :hide_subsection_label
 
   def initialize(id, hsh, subsection)
@@ -7,6 +7,7 @@ class Form::Page
     @subsection = subsection
     if hsh
       @header = hsh["header"]
+      @header_partial = hsh["header_partial"]
       @description = hsh["description"]
       @questions = hsh["questions"].map { |q_id, q| Form::Question.new(q_id, q, self) }
       @depends_on = hsh["depends_on"]
diff --git a/app/models/form/sales/pages/person2_age.rb b/app/models/form/sales/pages/person2_age.rb
index aaf818b5a..3b300f957 100644
--- a/app/models/form/sales/pages/person2_age.rb
+++ b/app/models/form/sales/pages/person2_age.rb
@@ -6,9 +6,9 @@ class Form::Sales::Pages::Person2Age < ::Form::Page
     @description = ""
     @subsection = subsection
     @depends_on = [
-      { "hholdcount" => 2 },
-      { "hholdcount" => 3 },
-      { "hholdcount" => 4 },
+      { "hholdcount" => 2, "details_known_2" => 1 },
+      { "hholdcount" => 3, "details_known_2" => 1 },
+      { "hholdcount" => 4, "details_known_2" => 1 },
     ]
   end
 
diff --git a/app/models/form/sales/pages/person2_known.rb b/app/models/form/sales/pages/person2_known.rb
new file mode 100644
index 000000000..c1eeebf20
--- /dev/null
+++ b/app/models/form/sales/pages/person2_known.rb
@@ -0,0 +1,21 @@
+class Form::Sales::Pages::Person2Known < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "person_2_known"
+    @header_partial = "person_2_known_page"
+    @header = ""
+    @description = ""
+    @subsection = subsection
+    @depends_on = [
+      { "hholdcount" => 2 },
+      { "hholdcount" => 3 },
+      { "hholdcount" => 4 },
+    ]
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::Person2Known.new(nil, nil, self),
+    ]
+  end
+end
diff --git a/app/models/form/sales/pages/person3_age.rb b/app/models/form/sales/pages/person3_age.rb
index 39aa45f27..0f8635b23 100644
--- a/app/models/form/sales/pages/person3_age.rb
+++ b/app/models/form/sales/pages/person3_age.rb
@@ -6,8 +6,8 @@ class Form::Sales::Pages::Person3Age < ::Form::Page
     @description = ""
     @subsection = subsection
     @depends_on = [
-      { "hholdcount" => 3 },
-      { "hholdcount" => 4 },
+      { "hholdcount" => 3, "details_known_3" => 1 },
+      { "hholdcount" => 4, "details_known_3" => 1 },
     ]
   end
 
diff --git a/app/models/form/sales/pages/person3_known.rb b/app/models/form/sales/pages/person3_known.rb
new file mode 100644
index 000000000..7671a0de4
--- /dev/null
+++ b/app/models/form/sales/pages/person3_known.rb
@@ -0,0 +1,20 @@
+class Form::Sales::Pages::Person3Known < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "person_3_known"
+    @header_partial = "person_3_known_page"
+    @header = ""
+    @description = ""
+    @subsection = subsection
+    @depends_on = [
+      { "hholdcount" => 3, "details_known_2" => 1 },
+      { "hholdcount" => 4, "details_known_2" => 1 },
+    ]
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::Person3Known.new(nil, nil, self),
+    ]
+  end
+end
diff --git a/app/models/form/sales/pages/person4_age.rb b/app/models/form/sales/pages/person4_age.rb
index d2ff447e3..42d926c2b 100644
--- a/app/models/form/sales/pages/person4_age.rb
+++ b/app/models/form/sales/pages/person4_age.rb
@@ -6,7 +6,7 @@ class Form::Sales::Pages::Person4Age < ::Form::Page
     @description = ""
     @subsection = subsection
     @depends_on = [
-      { "hholdcount" => 4 },
+      { "hholdcount" => 4, "details_known_4" => 1 },
     ]
   end
 
diff --git a/app/models/form/sales/pages/person4_known.rb b/app/models/form/sales/pages/person4_known.rb
new file mode 100644
index 000000000..c6c0208ea
--- /dev/null
+++ b/app/models/form/sales/pages/person4_known.rb
@@ -0,0 +1,19 @@
+class Form::Sales::Pages::Person4Known < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "person_4_known"
+    @header_partial = "person_4_known_page"
+    @header = ""
+    @description = ""
+    @subsection = subsection
+    @depends_on = [
+      { "hholdcount" => 4, "details_known_3" => 1 },
+    ]
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::Person4Known.new(nil, nil, self),
+    ]
+  end
+end
diff --git a/app/models/form/sales/questions/person2_age_known.rb b/app/models/form/sales/questions/person2_age_known.rb
index d91fc87ad..af06a0eb8 100644
--- a/app/models/form/sales/questions/person2_age_known.rb
+++ b/app/models/form/sales/questions/person2_age_known.rb
@@ -16,6 +16,12 @@ class Form::Sales::Questions::Person2AgeKnown < ::Form::Question
         {
           "age4_known" => 0,
         },
+        {
+          "details_known_2" => nil,
+        },
+        {
+          "details_known_2" => 2,
+        },
       ],
     }
   end
diff --git a/app/models/form/sales/questions/person2_known.rb b/app/models/form/sales/questions/person2_known.rb
new file mode 100644
index 000000000..bc931d23f
--- /dev/null
+++ b/app/models/form/sales/questions/person2_known.rb
@@ -0,0 +1,24 @@
+class Form::Sales::Questions::Person2Known < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "details_known_2"
+    @check_answer_label = "Details known for person 2?"
+    @header = "Do you know the details for person 2?"
+    @type = "radio"
+    @answer_options = ANSWER_OPTIONS
+    @page = page
+    @hint_text = ""
+    @hidden_in_check_answers = {
+      "depends_on" => [
+        {
+          "details_known_2" => 1,
+        },
+      ],
+    }
+  end
+
+  ANSWER_OPTIONS = {
+    "1" => { "value" => "Yes" },
+    "2" => { "value" => "No" },
+  }.freeze
+end
diff --git a/app/models/form/sales/questions/person3_age_known.rb b/app/models/form/sales/questions/person3_age_known.rb
index a0e5d3da1..c784ef1cb 100644
--- a/app/models/form/sales/questions/person3_age_known.rb
+++ b/app/models/form/sales/questions/person3_age_known.rb
@@ -16,6 +16,12 @@ class Form::Sales::Questions::Person3AgeKnown < ::Form::Question
         {
           "age5_known" => 0,
         },
+        {
+          "details_known_3" => nil,
+        },
+        {
+          "details_known_3" => 2,
+        },
       ],
     }
   end
diff --git a/app/models/form/sales/questions/person3_known.rb b/app/models/form/sales/questions/person3_known.rb
new file mode 100644
index 000000000..f6f79447e
--- /dev/null
+++ b/app/models/form/sales/questions/person3_known.rb
@@ -0,0 +1,24 @@
+class Form::Sales::Questions::Person3Known < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "details_known_3"
+    @check_answer_label = "Details known for person 3?"
+    @header = "Do you know the details for person 3?"
+    @type = "radio"
+    @answer_options = ANSWER_OPTIONS
+    @page = page
+    @hint_text = ""
+    @hidden_in_check_answers = {
+      "depends_on" => [
+        {
+          "details_known_3" => 1,
+        },
+      ],
+    }
+  end
+
+  ANSWER_OPTIONS = {
+    "1" => { "value" => "Yes" },
+    "2" => { "value" => "No" },
+  }.freeze
+end
diff --git a/app/models/form/sales/questions/person4_age_known.rb b/app/models/form/sales/questions/person4_age_known.rb
index 2ba5256da..e21aa51d6 100644
--- a/app/models/form/sales/questions/person4_age_known.rb
+++ b/app/models/form/sales/questions/person4_age_known.rb
@@ -16,6 +16,12 @@ class Form::Sales::Questions::Person4AgeKnown < ::Form::Question
         {
           "age6_known" => 0,
         },
+        {
+          "details_known_4" => nil,
+        },
+        {
+          "details_known_4" => 2,
+        },
       ],
     }
   end
diff --git a/app/models/form/sales/questions/person4_known.rb b/app/models/form/sales/questions/person4_known.rb
new file mode 100644
index 000000000..ab6d4c132
--- /dev/null
+++ b/app/models/form/sales/questions/person4_known.rb
@@ -0,0 +1,24 @@
+class Form::Sales::Questions::Person4Known < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "details_known_4"
+    @check_answer_label = "Details known for person 4?"
+    @header = "Do you know the details for person 4?"
+    @type = "radio"
+    @answer_options = ANSWER_OPTIONS
+    @page = page
+    @hint_text = ""
+    @hidden_in_check_answers = {
+      "depends_on" => [
+        {
+          "details_known_4" => 1,
+        },
+      ],
+    }
+  end
+
+  ANSWER_OPTIONS = {
+    "1" => { "value" => "Yes" },
+    "2" => { "value" => "No" },
+  }.freeze
+end
diff --git a/app/models/form/sales/subsections/household_characteristics.rb b/app/models/form/sales/subsections/household_characteristics.rb
index c7c0846c3..fb2b7dc6e 100644
--- a/app/models/form/sales/subsections/household_characteristics.rb
+++ b/app/models/form/sales/subsections/household_characteristics.rb
@@ -29,8 +29,11 @@ class Form::Sales::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Sales::Pages::Buyer2LiveInProperty.new(nil, nil, self),
       Form::Sales::Pages::NumberOfOthersInProperty.new(nil, nil, self),
       Form::Sales::Pages::Person1Age.new(nil, nil, self),
+      Form::Sales::Pages::Person2Known.new(nil, nil, self),
       Form::Sales::Pages::Person2Age.new(nil, nil, self),
+      Form::Sales::Pages::Person3Known.new(nil, nil, self),
       Form::Sales::Pages::Person3Age.new(nil, nil, self),
+      Form::Sales::Pages::Person4Known.new(nil, nil, self),
       Form::Sales::Pages::Person4Age.new(nil, nil, self),
     ]
   end
diff --git a/app/views/form/headers/_person_2_known_page.erb b/app/views/form/headers/_person_2_known_page.erb
new file mode 100644
index 000000000..e305e36f4
--- /dev/null
+++ b/app/views/form/headers/_person_2_known_page.erb
@@ -0,0 +1 @@
+You have given us the details for 1 of the <%= log.hholdcount %> other people in the household
diff --git a/app/views/form/headers/_person_3_known_page.erb b/app/views/form/headers/_person_3_known_page.erb
new file mode 100644
index 000000000..2fd31a963
--- /dev/null
+++ b/app/views/form/headers/_person_3_known_page.erb
@@ -0,0 +1 @@
+You have given us the details for 2 of the <%= log.hholdcount %> other people in the household
diff --git a/app/views/form/headers/_person_4_known_page.erb b/app/views/form/headers/_person_4_known_page.erb
new file mode 100644
index 000000000..b96949344
--- /dev/null
+++ b/app/views/form/headers/_person_4_known_page.erb
@@ -0,0 +1 @@
+You have given us the details for 3 of the <%= log.hholdcount %> other people in the household
diff --git a/app/views/form/page.html.erb b/app/views/form/page.html.erb
index 8d90f12b9..7a860c1db 100644
--- a/app/views/form/page.html.erb
+++ b/app/views/form/page.html.erb
@@ -11,12 +11,16 @@
       <% remove_other_page_errors(@log, @page) %>
       <%= f.govuk_error_summary %>
 
-      <% if @page.header.present? %>
+      <% if @page.header.present? || @page.header_partial.present? %>
         <h1 class="govuk-heading-l">
           <% if !@page.hide_subsection_label %>
             <span class="govuk-caption-l"><%= @subsection.label %></span>
           <% end %>
-          <%= @page.header %>
+          <% if @page.header_partial.present? %>
+            <%= render partial: "form/headers/#{@page.header_partial}", locals: { log: @log } %>
+          <% else %>
+            <%= @page.header %>
+          <% end %>
         </h1>
       <% end %>
 
@@ -32,7 +36,7 @@
           <% if question.type == "interruption_screen" %>
             <%= render partial: "form/#{question.type}_question", locals: { question:, caption_text: @subsection.label, page_header: @page.header, lettings_log: @log, title_text: @page.title_text, informative_text: @page.informative_text, form: @form, f:, conditional: false } %>
           <% else %>
-            <%= render partial: "form/#{question.type}_question", locals: { question:, caption_text: @subsection.label, page_header: @page.header, lettings_log: @log, f:, conditional: false } %>
+            <%= render partial: "form/#{question.type}_question", locals: { question:, caption_text: @page.header_partial.present? ? nil : @subsection.label, page_header: @page.header, lettings_log: @log, f:, conditional: false } %>
           <% end %>
         </div>
       <% end %>
diff --git a/db/migrate/20221010085259_add_details_known_to_sales_log.rb b/db/migrate/20221010085259_add_details_known_to_sales_log.rb
new file mode 100644
index 000000000..0b99acb2c
--- /dev/null
+++ b/db/migrate/20221010085259_add_details_known_to_sales_log.rb
@@ -0,0 +1,7 @@
+class AddDetailsKnownToSalesLog < ActiveRecord::Migration[7.0]
+  change_table :sales_logs, bulk: true do |t|
+    t.column :details_known_2, :integer
+    t.column :details_known_3, :integer
+    t.column :details_known_4, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index ebe7598a5..43fc94775 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -369,6 +369,9 @@ ActiveRecord::Schema[7.0].define(version: 2022_10_19_082625) do
     t.integer "la_known"
     t.integer "income1"
     t.integer "income1nk"
+    t.integer "details_known_2"
+    t.integer "details_known_3"
+    t.integer "details_known_4"
     t.index ["created_by_id"], name: "index_sales_logs_on_created_by_id"
     t.index ["managing_organisation_id"], name: "index_sales_logs_on_managing_organisation_id"
     t.index ["owning_organisation_id"], name: "index_sales_logs_on_owning_organisation_id"
diff --git a/spec/factories/sales_log.rb b/spec/factories/sales_log.rb
index 31c4f1882..8e37581c5 100644
--- a/spec/factories/sales_log.rb
+++ b/spec/factories/sales_log.rb
@@ -41,10 +41,13 @@ FactoryBot.define do
       wheel { 1 }
       age3_known { 0 }
       age3 { 40 }
+      details_known_2 { 1 }
       age4_known { 0 }
       age4 { 40 }
+      details_known_3 { 1 }
       age5_known { 0 }
       age5 { 40 }
+      details_known_4 { 1 }
       age6_known { 0 }
       age6 { 40 }
       income1nk { 0 }
diff --git a/spec/models/form/sales/pages/person2_age_spec.rb b/spec/models/form/sales/pages/person2_age_spec.rb
index d24797b43..7ade29b65 100644
--- a/spec/models/form/sales/pages/person2_age_spec.rb
+++ b/spec/models/form/sales/pages/person2_age_spec.rb
@@ -29,11 +29,7 @@ RSpec.describe Form::Sales::Pages::Person2Age, type: :model do
 
   it "has correct depends_on" do
     expect(page.depends_on).to eq(
-      [
-        { "hholdcount" => 2 },
-        { "hholdcount" => 3 },
-        { "hholdcount" => 4 },
-      ],
+      [{ "details_known_2" => 1, "hholdcount" => 2 }, { "details_known_2" => 1, "hholdcount" => 3 }, { "details_known_2" => 1, "hholdcount" => 4 }],
     )
   end
 end
diff --git a/spec/models/form/sales/pages/person2_known_spec.rb b/spec/models/form/sales/pages/person2_known_spec.rb
new file mode 100644
index 000000000..57bac950f
--- /dev/null
+++ b/spec/models/form/sales/pages/person2_known_spec.rb
@@ -0,0 +1,43 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::Person2Known, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+
+  let(:page_id) { nil }
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection) }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has correct questions" do
+    expect(page.questions.map(&:id)).to eq(%w[details_known_2])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("person_2_known")
+  end
+
+  it "has the correct header" do
+    expect(page.header).to eq("")
+  end
+
+  it "has the correct header_partial" do
+    expect(page.header_partial).to eq("person_2_known_page")
+  end
+
+  it "has the correct description" do
+    expect(page.description).to eq("")
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to eq(
+      [
+        { "hholdcount" => 2 },
+        { "hholdcount" => 3 },
+        { "hholdcount" => 4 },
+      ],
+    )
+  end
+end
diff --git a/spec/models/form/sales/pages/person3_age_spec.rb b/spec/models/form/sales/pages/person3_age_spec.rb
index ca3a36c94..5089ae7ae 100644
--- a/spec/models/form/sales/pages/person3_age_spec.rb
+++ b/spec/models/form/sales/pages/person3_age_spec.rb
@@ -29,10 +29,7 @@ RSpec.describe Form::Sales::Pages::Person3Age, type: :model do
 
   it "has correct depends_on" do
     expect(page.depends_on).to eq(
-      [
-        { "hholdcount" => 3 },
-        { "hholdcount" => 4 },
-      ],
+      [{ "details_known_3" => 1, "hholdcount" => 3 }, { "details_known_3" => 1, "hholdcount" => 4 }],
     )
   end
 end
diff --git a/spec/models/form/sales/pages/person3_known_spec.rb b/spec/models/form/sales/pages/person3_known_spec.rb
new file mode 100644
index 000000000..ef4c1c34d
--- /dev/null
+++ b/spec/models/form/sales/pages/person3_known_spec.rb
@@ -0,0 +1,42 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::Person3Known, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+
+  let(:page_id) { nil }
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection) }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has correct questions" do
+    expect(page.questions.map(&:id)).to eq(%w[details_known_3])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("person_3_known")
+  end
+
+  it "has the correct header" do
+    expect(page.header).to eq("")
+  end
+
+  it "has the correct header_partial" do
+    expect(page.header_partial).to eq("person_3_known_page")
+  end
+
+  it "has the correct description" do
+    expect(page.description).to eq("")
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to eq(
+      [
+        { "details_known_2" => 1, "hholdcount" => 3 },
+        { "details_known_2" => 1, "hholdcount" => 4 },
+      ],
+    )
+  end
+end
diff --git a/spec/models/form/sales/pages/person4_age_spec.rb b/spec/models/form/sales/pages/person4_age_spec.rb
index cc61b3287..e8b331435 100644
--- a/spec/models/form/sales/pages/person4_age_spec.rb
+++ b/spec/models/form/sales/pages/person4_age_spec.rb
@@ -29,9 +29,7 @@ RSpec.describe Form::Sales::Pages::Person4Age, type: :model do
 
   it "has correct depends_on" do
     expect(page.depends_on).to eq(
-      [
-        { "hholdcount" => 4 },
-      ],
+      [{ "details_known_4" => 1, "hholdcount" => 4 }],
     )
   end
 end
diff --git a/spec/models/form/sales/pages/person4_known_spec.rb b/spec/models/form/sales/pages/person4_known_spec.rb
new file mode 100644
index 000000000..024c121c9
--- /dev/null
+++ b/spec/models/form/sales/pages/person4_known_spec.rb
@@ -0,0 +1,41 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::Person4Known, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+
+  let(:page_id) { nil }
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection) }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has correct questions" do
+    expect(page.questions.map(&:id)).to eq(%w[details_known_4])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("person_4_known")
+  end
+
+  it "has the correct header" do
+    expect(page.header).to eq("")
+  end
+
+  it "has the correct header_partial" do
+    expect(page.header_partial).to eq("person_4_known_page")
+  end
+
+  it "has the correct description" do
+    expect(page.description).to eq("")
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to eq(
+      [
+        { "details_known_3" => 1, "hholdcount" => 4 },
+      ],
+    )
+  end
+end
diff --git a/spec/models/form/sales/questions/person2_age_known_spec.rb b/spec/models/form/sales/questions/person2_age_known_spec.rb
index e64db0dff..7ebee9dee 100644
--- a/spec/models/form/sales/questions/person2_age_known_spec.rb
+++ b/spec/models/form/sales/questions/person2_age_known_spec.rb
@@ -51,11 +51,7 @@ RSpec.describe Form::Sales::Questions::Person2AgeKnown, type: :model do
   it "has the correct hidden_in_check_answers" do
     expect(question.hidden_in_check_answers).to eq(
       {
-        "depends_on" => [
-          {
-            "age4_known" => 0,
-          },
-        ],
+        "depends_on" => [{ "age4_known" => 0 }, { "details_known_2" => nil }, { "details_known_2" => 2 }],
       },
     )
   end
diff --git a/spec/models/form/sales/questions/person2_known_spec.rb b/spec/models/form/sales/questions/person2_known_spec.rb
new file mode 100644
index 000000000..4e8a639c0
--- /dev/null
+++ b/spec/models/form/sales/questions/person2_known_spec.rb
@@ -0,0 +1,60 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Questions::Person2Known, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page) }
+
+  let(:question_id) { nil }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("details_known_2")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("Do you know the details for person 2?")
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("Details known for person 2?")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "1" => { "value" => "Yes" },
+      "2" => { "value" => "No" },
+    })
+  end
+
+  it "has correct conditional for" do
+    expect(question.conditional_for).to eq(nil)
+  end
+
+  it "has the correct hint" do
+    expect(question.hint_text).to eq("")
+  end
+
+  it "has the correct hidden_in_check_answers" do
+    expect(question.hidden_in_check_answers).to eq(
+      {
+        "depends_on" => [
+          {
+            "details_known_2" => 1,
+          },
+        ],
+      },
+    )
+  end
+end
diff --git a/spec/models/form/sales/questions/person3_age_known_spec.rb b/spec/models/form/sales/questions/person3_age_known_spec.rb
index 3b3ef6ff2..bb1762c88 100644
--- a/spec/models/form/sales/questions/person3_age_known_spec.rb
+++ b/spec/models/form/sales/questions/person3_age_known_spec.rb
@@ -51,11 +51,7 @@ RSpec.describe Form::Sales::Questions::Person3AgeKnown, type: :model do
   it "has the correct hidden_in_check_answers" do
     expect(question.hidden_in_check_answers).to eq(
       {
-        "depends_on" => [
-          {
-            "age5_known" => 0,
-          },
-        ],
+        "depends_on" => [{ "age5_known" => 0 }, { "details_known_3" => nil }, { "details_known_3" => 2 }],
       },
     )
   end
diff --git a/spec/models/form/sales/questions/person3_known_spec.rb b/spec/models/form/sales/questions/person3_known_spec.rb
new file mode 100644
index 000000000..bab7d864c
--- /dev/null
+++ b/spec/models/form/sales/questions/person3_known_spec.rb
@@ -0,0 +1,60 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Questions::Person3Known, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page) }
+
+  let(:question_id) { nil }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("details_known_3")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("Do you know the details for person 3?")
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("Details known for person 3?")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "1" => { "value" => "Yes" },
+      "2" => { "value" => "No" },
+    })
+  end
+
+  it "has correct conditional for" do
+    expect(question.conditional_for).to eq(nil)
+  end
+
+  it "has the correct hint" do
+    expect(question.hint_text).to eq("")
+  end
+
+  it "has the correct hidden_in_check_answers" do
+    expect(question.hidden_in_check_answers).to eq(
+      {
+        "depends_on" => [
+          {
+            "details_known_3" => 1,
+          },
+        ],
+      },
+    )
+  end
+end
diff --git a/spec/models/form/sales/questions/person4_age_known_spec.rb b/spec/models/form/sales/questions/person4_age_known_spec.rb
index c72d92997..41a64cbea 100644
--- a/spec/models/form/sales/questions/person4_age_known_spec.rb
+++ b/spec/models/form/sales/questions/person4_age_known_spec.rb
@@ -51,11 +51,7 @@ RSpec.describe Form::Sales::Questions::Person4AgeKnown, type: :model do
   it "has the correct hidden_in_check_answers" do
     expect(question.hidden_in_check_answers).to eq(
       {
-        "depends_on" => [
-          {
-            "age6_known" => 0,
-          },
-        ],
+        "depends_on" => [{ "age6_known" => 0 }, { "details_known_4" => nil }, { "details_known_4" => 2 }],
       },
     )
   end
diff --git a/spec/models/form/sales/questions/person4_known_spec.rb b/spec/models/form/sales/questions/person4_known_spec.rb
new file mode 100644
index 000000000..667a71f01
--- /dev/null
+++ b/spec/models/form/sales/questions/person4_known_spec.rb
@@ -0,0 +1,60 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Questions::Person4Known, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page) }
+
+  let(:question_id) { nil }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("details_known_4")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("Do you know the details for person 4?")
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("Details known for person 4?")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "1" => { "value" => "Yes" },
+      "2" => { "value" => "No" },
+    })
+  end
+
+  it "has correct conditional for" do
+    expect(question.conditional_for).to eq(nil)
+  end
+
+  it "has the correct hint" do
+    expect(question.hint_text).to eq("")
+  end
+
+  it "has the correct hidden_in_check_answers" do
+    expect(question.hidden_in_check_answers).to eq(
+      {
+        "depends_on" => [
+          {
+            "details_known_4" => 1,
+          },
+        ],
+      },
+    )
+  end
+end
diff --git a/spec/models/form/sales/subsections/household_characteristics_spec.rb b/spec/models/form/sales/subsections/household_characteristics_spec.rb
index 1c0bdca86..dbe8a24a3 100644
--- a/spec/models/form/sales/subsections/household_characteristics_spec.rb
+++ b/spec/models/form/sales/subsections/household_characteristics_spec.rb
@@ -34,8 +34,11 @@ RSpec.describe Form::Sales::Subsections::HouseholdCharacteristics, type: :model
         buyer_2_live_in_property
         number_of_others_in_property
         person_1_age
+        person_2_known
         person_2_age
+        person_3_known
         person_3_age
+        person_4_known
         person_4_age
       ],
     )
diff --git a/spec/models/form_handler_spec.rb b/spec/models/form_handler_spec.rb
index 87a04487a..81a9b1c45 100644
--- a/spec/models/form_handler_spec.rb
+++ b/spec/models/form_handler_spec.rb
@@ -61,14 +61,14 @@ RSpec.describe FormHandler do
     it "is able to load a current sales form" do
       form = form_handler.get_form("current_sales")
       expect(form).to be_a(Form)
-      expect(form.pages.count).to eq(41)
+      expect(form.pages.count).to eq(44)
       expect(form.name).to eq("2022_2023_sales")
     end
 
     it "is able to load a previous sales form" do
       form = form_handler.get_form("previous_sales")
       expect(form).to be_a(Form)
-      expect(form.pages.count).to eq(41)
+      expect(form.pages.count).to eq(44)
       expect(form.name).to eq("2021_2022_sales")
     end
   end