Fix a issue that prevent family from being deleted

geneit_backend/src/services/members_service.rs

@@ -114,6 +114,10 @@ pub async fn delete(member: &mut Member) -> anyhow::Result<()> {
         couples_service::delete(&mut c).await?;
     }
 
+    // Remove mother and father links
+    member.set_mother(None);
+    member.set_father(None);
+
     remove_photo(member).await?;
 
     // Remove the member