diff --git a/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb b/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
index fed7ec470..46900b9ce 100644
--- a/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
+++ b/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
@@ -9,7 +9,7 @@ class Form::Lettings::Pages::LeadTenantSexRegisteredAtBirth < ::Form::Page
 
   def questions
     @questions ||= [
-      Form::Lettings::Questions::SexRegisteredAtBirth1.new(nil, nil, self),
+      Form::Lettings::Questions::LeadTenantSexRegisteredAtBirth.new(nil, nil, self),
     ]
   end
 end
diff --git a/app/models/form/lettings/pages/person_sex_registered_at_birth.rb b/app/models/form/lettings/pages/person_sex_registered_at_birth.rb
index ea1586f5e..3c5b033ba 100644
--- a/app/models/form/lettings/pages/person_sex_registered_at_birth.rb
+++ b/app/models/form/lettings/pages/person_sex_registered_at_birth.rb
@@ -6,7 +6,7 @@ class Form::Lettings::Pages::PersonSexRegisteredAtBirth < ::Form::Page
     @id = "person_#{person_index}_sex_registered_at_birth"
     @person_index = person_index
     @depends_on = [
-      { "details_known_#{person_index}" => 0 },
+      { "details_known_#{person_index}" => 1 },
     ]
   end
 
diff --git a/app/models/form/lettings/questions/sex_registered_at_birth1.rb b/app/models/form/lettings/questions/lead_tenant_sex_registered_at_birth.rb
similarity index 87%
rename from app/models/form/lettings/questions/sex_registered_at_birth1.rb
rename to app/models/form/lettings/questions/lead_tenant_sex_registered_at_birth.rb
index 812f8785d..d9eb5d38f 100644
--- a/app/models/form/lettings/questions/sex_registered_at_birth1.rb
+++ b/app/models/form/lettings/questions/lead_tenant_sex_registered_at_birth.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::Lettings::Questions::SexRegisteredAtBirth1 < ::Form::Question
+class Form::Lettings::Questions::LeadTenantSexRegisteredAtBirth < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "sexrab1"
diff --git a/app/models/form/lettings/questions/person_sex_registered_at_birth.rb b/app/models/form/lettings/questions/person_sex_registered_at_birth.rb
index 3d8db0312..0ac96f841 100644
--- a/app/models/form/lettings/questions/person_sex_registered_at_birth.rb
+++ b/app/models/form/lettings/questions/person_sex_registered_at_birth.rb
@@ -5,6 +5,12 @@ class Form::Lettings::Questions::PersonSexRegisteredAtBirth < ::Form::Question
     super(id, hsh, page)
     @type = "radio"
     @check_answers_card_number = person_index
+    @inferred_check_answers_value = [{
+                                       "condition" => {
+                                         id => "R",
+                                       },
+                                       "value" => "Person prefers not to say",
+                                     }]
     @answer_options = ANSWER_OPTIONS
     @question_number = QUESTION_NUMBER_FROM_YEAR[form.start_date.year] || QUESTION_NUMBER_FROM_YEAR[QUESTION_NUMBER_FROM_YEAR.keys.max]
   end
diff --git a/spec/models/form/lettings/pages/lead_tenant_sex_registered_at_birth_spec.rb b/spec/models/form/lettings/pages/lead_tenant_sex_registered_at_birth_spec.rb
new file mode 100644
index 000000000..fcc655849
--- /dev/null
+++ b/spec/models/form/lettings/pages/lead_tenant_sex_registered_at_birth_spec.rb
@@ -0,0 +1,29 @@
+require "rails_helper"
+
+RSpec.describe Form::Lettings::Pages::LeadTenantSexRegisteredAtBirth, 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, form: instance_double(Form, start_date: Time.zone.local(2026, 4, 1))) }
+
+  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[sexrab1])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("lead_tenant_sex_registered_at_birth")
+  end
+
+  it "has the correct description" do
+    expect(page.description).to be_nil
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to eq([{ "declaration" => 1 }])
+  end
+end
diff --git a/spec/models/form/lettings/pages/person_sex_registered_at_birth_spec.rb b/spec/models/form/lettings/pages/person_sex_registered_at_birth_spec.rb
new file mode 100644
index 000000000..098911bfc
--- /dev/null
+++ b/spec/models/form/lettings/pages/person_sex_registered_at_birth_spec.rb
@@ -0,0 +1,138 @@
+require "rails_helper"
+
+RSpec.describe Form::Lettings::Pages::PersonSexRegisteredAtBirth, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection, person_index:) }
+
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection, form: instance_double(Form, start_date: Time.zone.local(2026, 4, 1))) }
+  let(:person_index) { 1 }
+
+  let(:page_id) { "person_2_sex_registered_at_birth" }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has the correct description" do
+    expect(page.description).to be_nil
+  end
+
+  context "with person 2" do
+    let(:person_index) { 2 }
+    let(:page_id) { "person_2_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab2])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_2_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_2" => 1 }])
+    end
+  end
+
+  context "with person 3" do
+    let(:person_index) { 3 }
+    let(:page_id) { "person_3_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab3])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_3_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_3" => 1 }])
+    end
+  end
+
+  context "with person 4" do
+    let(:person_index) { 4 }
+    let(:page_id) { "person_4_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab4])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_4_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_4" => 1 }])
+    end
+  end
+
+  context "with person 5" do
+    let(:person_index) { 5 }
+    let(:page_id) { "person_5_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab5])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_5_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_5" => 1 }])
+    end
+  end
+
+  context "with person 6" do
+    let(:person_index) { 6 }
+    let(:page_id) { "person_6_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab6])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_6_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_6" => 1 }])
+    end
+  end
+
+  context "with person 7" do
+    let(:person_index) { 7 }
+    let(:page_id) { "person_7_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab7])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_7_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_7" => 1 }])
+    end
+  end
+
+  context "with person 8" do
+    let(:person_index) { 8 }
+    let(:page_id) { "person_8_sex_registered_at_birth" }
+
+    it "has correct questions" do
+      expect(page.questions.map(&:id)).to eq(%w[sexrab8])
+    end
+
+    it "has the correct id" do
+      expect(page.id).to eq("person_8_sex_registered_at_birth")
+    end
+
+    it "has correct depends_on" do
+      expect(page.depends_on).to eq([{ "details_known_8" => 1 }])
+    end
+  end
+end
diff --git a/spec/models/form/lettings/questions/lead_tenant_sex_registered_at_birth_spec.rb b/spec/models/form/lettings/questions/lead_tenant_sex_registered_at_birth_spec.rb
new file mode 100644
index 000000000..2707b0246
--- /dev/null
+++ b/spec/models/form/lettings/questions/lead_tenant_sex_registered_at_birth_spec.rb
@@ -0,0 +1,45 @@
+require "rails_helper"
+
+RSpec.describe Form::Lettings::Questions::LeadTenantSexRegisteredAtBirth, 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) }
+  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2026, 4, 1)) }
+
+  before do
+    allow(page).to receive(:subsection).and_return(subsection)
+    allow(subsection).to receive(:form).and_return(form)
+  end
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("sexrab1")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?(nil)).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "F" => { "value" => "Female" },
+      "M" => { "value" => "Male" },
+      "divider" => { "value" => true },
+      "R" => { "value" => "Lead tenant prefers not to say" },
+    })
+  end
+
+  it "has the correct check_answers_card_number" do
+    expect(question.check_answers_card_number).to eq(1)
+  end
+end
diff --git a/spec/models/form/lettings/questions/person_sex_registered_at_birth_spec.rb b/spec/models/form/lettings/questions/person_sex_registered_at_birth_spec.rb
new file mode 100644
index 000000000..e80417c5b
--- /dev/null
+++ b/spec/models/form/lettings/questions/person_sex_registered_at_birth_spec.rb
@@ -0,0 +1,171 @@
+require "rails_helper"
+
+RSpec.describe Form::Lettings::Questions::PersonSexRegisteredAtBirth, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page, person_index:) }
+
+  let(:question_id) { "sexrab2" }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+  let(:person_index) { 2 }
+  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2026, 4, 1)) }
+
+  before do
+    allow(page).to receive(:subsection).and_return(subsection)
+    allow(subsection).to receive(:form).and_return(form)
+  end
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?(nil)).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "F" => { "value" => "Female" },
+      "M" => { "value" => "Male" },
+      "divider" => { "value" => true },
+      "R" => { "value" => "Person prefers not to say" },
+    })
+  end
+
+  context "when person 2" do
+    let(:question_id) { "sexrab2" }
+    let(:person_index) { 2 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab2")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(2)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+        { "condition" => { "sexrab2" => "R" }, "value" => "Person prefers not to say" },
+      ])
+    end
+  end
+
+  context "when person 3" do
+    let(:question_id) { "sexrab3" }
+    let(:person_index) { 3 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab3")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(3)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+        { "condition" => { "sexrab3" => "R" }, "value" => "Person prefers not to say" },
+      ])
+    end
+  end
+
+  context "when person 4" do
+    let(:question_id) { "sexrab4" }
+    let(:person_index) { 4 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab4")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(4)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+        { "condition" => { "sexrab4" => "R" }, "value" => "Person prefers not to say" },
+      ])
+    end
+  end
+
+  context "when person 5" do
+    let(:question_id) { "sexrab5" }
+    let(:person_index) { 5 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab5")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(5)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+        { "condition" => { "sexrab5" => "R" }, "value" => "Person prefers not to say" },
+      ])
+    end
+  end
+
+  context "when person 6" do
+    let(:question_id) { "sexrab6" }
+    let(:person_index) { 6 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab6")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(6)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+        { "condition" => { "sexrab6" => "R" }, "value" => "Person prefers not to say" },
+      ])
+    end
+  end
+
+  context "when person 7" do
+    let(:question_id) { "sexrab7" }
+    let(:person_index) { 7 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab7")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(7)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+                                                            { "condition" => { "sexrab7" => "R" }, "value" => "Person prefers not to say" },
+                                                          ])
+    end
+  end
+
+  context "when person 8" do
+    let(:question_id) { "sexrab8" }
+    let(:person_index) { 8 }
+
+    it "has the correct id" do
+      expect(question.id).to eq("sexrab8")
+    end
+
+    it "has expected check answers card number" do
+      expect(question.check_answers_card_number).to eq(8)
+    end
+
+    it "has the correct inferred_check_answers_value" do
+      expect(question.inferred_check_answers_value).to eq([
+                                                            { "condition" => { "sexrab8" => "R" }, "value" => "Person prefers not to say" },
+                                                          ])
+    end
+  end
+end