When one contract has different owners from another contract, those contracts are in different memberships. So the contract your DD owns with you is in a membership separate from the contracts you own without her. And as you found out, the only way to combine points from two separate memberships is to transfer from one to the other. We added adult DD to both of our contracts, and we kept the same membership number. So,
@Sheree, be sure to add your son to both of your contracts at the same time. Don’t plan to do one then the other later - we almost did that by accident.