diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index 8cb17c8cb..f45c592e7 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -352,7 +352,7 @@ private
       self.vyear = property_void_date.year
     end
     self.incref = 1 if net_income_refused?
-    self.hhmemb = other_hhmemb + 1 if other_hhmemb.present?
+    self.other_hhmemb = hhmemb - 1 if hhmemb.present?
     self.renttype = RENT_TYPE_MAPPING[rent_type]
     self.lettype = get_lettype
     self.totchild = get_totchild
diff --git a/config/forms/2021_2022.json b/config/forms/2021_2022.json
index b6762b34c..7c79550e1 100644
--- a/config/forms/2021_2022.json
+++ b/config/forms/2021_2022.json
@@ -1149,12 +1149,12 @@
               "header": "",
               "description": "",
               "questions": {
-                "other_hhmemb": {
-                  "check_answer_label": "Number of other household members",
+                "hhmemb": {
+                  "check_answer_label": "Number of household members",
                   "header": "How many people live in the household for this letting?",
                   "hint_text": "You can provide details for a maximum of 8 people.",
                   "type": "numeric",
-                  "min": 0,
+                  "min": 1,
                   "max": 8,
                   "step": 1,
                   "width": 2
diff --git a/spec/models/case_log_spec.rb b/spec/models/case_log_spec.rb
index 3b506e02e..9684f80a0 100644
--- a/spec/models/case_log_spec.rb
+++ b/spec/models/case_log_spec.rb
@@ -202,7 +202,7 @@ RSpec.describe CaseLog do
         mrcdate: Time.gm(2021, 5, 4),
         property_void_date: Time.gm(2021, 3, 3),
         net_income_known: 2,
-        other_hhmemb: 6,
+        hhmemb: 7,
         rent_type: 4,
         needstype: 1,
         hb: 1,
@@ -247,9 +247,9 @@ RSpec.describe CaseLog do
       expect(record_from_db["incref"]).to eq(1)
     end
 
-    it "correctly derives and saves hhmemb" do
-      record_from_db = ActiveRecord::Base.connection.execute("select hhmemb from case_logs where id=#{case_log.id}").to_a[0]
-      expect(record_from_db["hhmemb"]).to eq(7)
+    it "correctly derives and saves other_hhmemb" do
+      record_from_db = ActiveRecord::Base.connection.execute("select other_hhmemb from case_logs where id=#{case_log.id}").to_a[0]
+      expect(record_from_db["other_hhmemb"]).to eq(6)
     end
 
     it "correctly derives and saves renttype" do