Multiple records don't sync on same source table

I have record A and a record B on same source table but using different sync filters, all the DB writes and updates are happening through record A, so it is holding all the updated values, but record B is not getting synced to update the latest values.

I tried establishing one to one relationship between record A and B, using same primary key, but still sync doesn't happen.

Is there any other way to sync the record B whenever an update happens to the source table through record A?