My sister is a single mom of a disabled young woman - has memberships at OKW and BWV. They love WDW because the can have a relaxing time with my neices handycap. WDW does do a good job of making magic for all their guests.
I think there are many single parents, moms & dads. I've seen folks posting here and on the AOL board. In fact, I think you'll find almost every type of person/family is a member of DVC from grandparents, to singles, to gay couples, to one parents families to....mom, dad & kids families.