I had a situation where I made three reservations. Two were for my family and one was for someone renting points. All of them were made with the same Membership number, but the points were spread over 5 different contracts within that account. Then I decided to ADD my adult kids to two of the contracts, and leave the other contracts as they were, in just the name of my wife and myself. On the day that I was contacted by the Title Company (the same title company that Disney uses for DVC), and informed that my changes were all done and had been submitted to Disney and the State of Florida, I found out that Disney tends to cancel reservations, if you sell the contract. Suddenly, I was in a panic. I hadn't sold the contracts, my wife and I were still owners, but now my kids would be on two of them.
I couldn't afford to lose my reservations since ALL the resorts were now nearly 100% booked out for those dates, and I wouldn't be able to replace them. So, I contacted the DVC member help line (Reservations) and explained my predicament to them. After about 20 minutes passing while the Reservation person talked to her Supervisors, and then talked with the people in Sales and Administration, she gave me the answer I was hoping to receive: First, because my contracts were no longer in the exact same names, my membership account WOULD be split into two. They haven't done this yet, but they will. 2 contracts will be in one account and 3 in the other. But, Second, my reservations would be okay!! Since my wife and I were both still listed as owners or part owners on all the accounts, they would continue to treat these reservations normally. She also told me that IF there were any problems down the road, and if anything popped up once Disney recorded the changes and split the accounts, that ADMIN promised they would contact me to help me shift points around to continue to cover the reservations.