This is what I'd suggest LW do as well.
Going around Husband entirely so that Sister makes her offer/gift/529 account to the legally an adult 18 year old son seems the most effective course of action, if not the most peaceful one.
Other options:
no subject
This is what I'd suggest LW do as well.
Going around Husband entirely so that Sister makes her offer/gift/529 account to the legally an adult 18 year old son seems the most effective course of action, if not the most peaceful one.