Yes, 529 plans can be transferred between immediate family members of the beneficiary, and to you if you opened the plan. If a child has finished college (or stopped attending, etc.), and there are still funds available in the plan, it's perfectly permissible to transfer the account to another child if there is no overlapping of college attendance (and expenses being used from the same 529 plan) between the two children. It's not allowed to use the 529 plan for two children at the same time; a transfer must be made prior to using the 529 plan on another child. The same prohibition of overlapping education expenses is true for anyone else in the immediate family; the transfer must be made and the expenses not overlap.