好像是可以的。
You can, however, change the beneficiary of the 529 plan to your grandchild. As long as the new beneficiary is a family member of the current beneficiary, there will be no tax consequences,
另外,529也不在遗产免税总额里。The money in a 529 account is exempt from federal estate tax. In other words, the amount saved in a 529 account does not count toward your taxable estate.
529 的确是避税利器。