CLDC-4177: Adds SAB form for the primary buyer.

app/models/form/sales/pages/sex_registered_at_birth1.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Form::Sales::Pages::SexRegisteredAtBirth1 < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @id = "buyer_1_sex_registered_at_birth"
+    @depends_on = [
+      {
+        "buyer_has_seen_privacy_notice?" => true,
+      },
+      {
+        "buyer_not_interviewed?" => true,
+      },
+    ]
+  end
+
+  def questions
+    @questions ||= [
+      Form::Sales::Questions::SexRegisteredAtBirth1.new(nil, nil, self),
+    ]
+  end
+end

app/models/form/sales/questions/sex_registered_at_birth1.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::Sales::Questions::SexRegisteredAtBirth1 < Form::Question
+class Form::Sales::Questions::SexRegisteredAtBirth1 < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "sexRAB1"

app/models/form/sales/subsections/household_characteristics.rb

@@ -24,6 +24,7 @@ class Form::Sales::Subsections::HouseholdCharacteristics < ::Form::Subsection
       (Form::Sales::Pages::NotRetiredValueCheck.new("age_1_not_retired_value_check", nil, self, person_index: 1) if form.start_year_2024_or_later?),
       Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_1_old_persons_shared_ownership_joint_purchase_value_check", nil, self, joint_purchase: true),
       Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck.new("age_1_old_persons_shared_ownership_value_check", nil, self, joint_purchase: false),
+      Form::Sales::Pages::SexRegisteredAtBirth1.new(nil, nil, self),
       Form::Sales::Pages::GenderIdentity1.new(nil, nil, self),
       Form::Sales::Pages::Buyer1EthnicGroup.new(nil, nil, self),
       Form::Sales::Pages::Buyer1EthnicBackgroundBlack.new(nil, nil, self),

config/locales/forms/2026/sales/household_characteristics.en.yml

@@ -16,6 +16,13 @@ en:
               hint_text: ""
               question_text: "Age"
 
+          sexRAB1:
+            page_header: ""
+            check_answer_label: "Buyer 1’s sex registered at birth"
+            check_answer_prompt: ""
+            hint_text: "This is your sex that was registered at birth. The next question will ask about your gender identity."
+            question_text: "What is your sex?"
+
           sex1:
             page_header: ""
             check_answer_label: "Buyer 1’s gender identity"