feat(clients): require Mother + Father/Caretaker as family members before activation

- Add hasMother/hasFather/hasCaretaker/familyRelationshipRulesMet to
  ClientFamilyMembersStepComponent, matched against the RELATIONSHIP code value label.
- Show two independent inline error banners (never merged into one message) when Mother, or
  both Father and Caretaker, are missing.
- Gate "Save & Next" and final Submit on this rule in both the create and edit client flows —
  the edit flow previously treated the Family tab as unconditionally optional.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/clients/client-stepper/client-family-members-step/client-family-members-step.component.html

@@ -62,6 +62,22 @@
     </div>
   }
 
+  <!-- Mother requirement — shown independently of the Father/Caretaker check below -->
+  @if (!nomineeOnly && clientFamilyMembers.length > 0 && !hasMother) {
+    <div class="fm-step__empty fm-step__empty--required">
+      <mat-icon class="fm-step__empty-icon">error_outline</mat-icon>
+      <span class="fm-step__empty-required">Mother is required.</span>
+    </div>
+  }
+
+  <!-- Father-or-Caretaker requirement — shown independently of the Mother check above -->
+  @if (!nomineeOnly && clientFamilyMembers.length > 0 && !hasFather && !hasCaretaker) {
+    <div class="fm-step__empty fm-step__empty--required">
+      <mat-icon class="fm-step__empty-icon">error_outline</mat-icon>
+      <span class="fm-step__empty-required">Either Father or a Caretaker is required.</span>
+    </div>
+  }
+
   <!-- Spouse hint for married clients -->
   @if (!nomineeOnly && isMarried && !hasSpouse) {
     <div class="fm-spouse-hint">

src/app/clients/client-stepper/client-family-members-step/client-family-members-step.component.ts

@@ -223,6 +223,33 @@ export class ClientFamilyMembersStepComponent implements OnInit {
     return this.clientFamilyMembers.length > 0;
   }
 
+  /** True if a family member with the given relationship (case-insensitive) has been added */
+  private hasRelationship(name: string): boolean {
+    const target = name.toLowerCase();
+    return this.clientFamilyMembers.some((m: any) => {
+      const resolved = this.getRelName(m.relationshipId ?? m.relationship).toLowerCase();
+      if (resolved === target) return true;
+      return typeof m.relationship === 'string' && m.relationship.toLowerCase() === target;
+    });
+  }
+
+  get hasMother(): boolean {
+    return this.hasRelationship('mother');
+  }
+
+  get hasFather(): boolean {
+    return this.hasRelationship('father');
+  }
+
+  get hasCaretaker(): boolean {
+    return this.hasRelationship('caretaker');
+  }
+
+  /** Mother is always required; Father is required unless a Caretaker has been added instead. */
+  get familyRelationshipRulesMet(): boolean {
+    return this.hasMother && (this.hasFather || this.hasCaretaker);
+  }
+
   /** Check if client's marital status is "Married" */
   get isMarried(): boolean {
     if (!this.maritalStatusId || !this.maritalStatusOptions?.length) return false;