fix family card issue

app/Services/Parents/ParentRegistrationService.php

@@ -10,6 +10,7 @@ use App\Models\StudentModel;
 use App\Models\UserModel;
 use App\Services\PhoneFormatterService;
 use App\Services\SchoolIdService;
+use App\Services\FamilyDataSyncService;
 use CodeIgniter\Database\BaseConnection;
 use CodeIgniter\Database\Exceptions\DatabaseException;
 use DateTime;
@@ -296,6 +297,12 @@ class ParentRegistrationService
             }
         }
 
+        // Deleting a student cascades the normalized family_students row, but
+        // intentionally leaves the household and guardian records in place.
+        // Always restore that membership when a child is added again (and heal
+        // older registrations that pre-date the normalized family tables).
+        (new FamilyDataSyncService($this->db))->syncForParent($parentId);
+
         $this->medicalConditionModel->where('student_id', $studentId)->delete();
         foreach ((array) $conditions as $condition) {
             $condition = trim((string) $condition);