Not to be "Debbie Downer" here, but I strongly suggest that people think long and hard before adding others as owners to your account. If you do, your
DVC becomes a joint asset. That means if, in this case, your adult child were to marry and divorce, your DVC may be looked at as a joint asset in any divorce proceedings. Now you might not mind losing an idiot as a son/daughter-in-law who would dare to mess with your DVC, but how happy would you be if you lost your points along with them??? This applies to bankruptcy also. If a co-owner ends up filing for bankruptcy, the courts may demand that the DVC membership is sold to offset debts.
Just another point of view...