We have actually had to show our DVC card in the past especially at Golf where they said DM would have to be one of the golfers (That went over like a fart in church with DH!). My mom & I also lives 4 1/2 hours away from each other so 2 cards would be helpful for that reason. My mom had made the primary investment and I have paid for the add on's and just cut her a check once a month thereby not changing the deed.