I think her parents have already said that they're willing to let Michael keep the money, if he'll just divorce Terry so that they can have custody of her
I believe it's all about a power trip for Michael at this point; he won't release her because he believes he should be in charge of her life.
it's much worse than that, though. it's an attempt to remake our country on behalf of some powerful pro-euthenasia lobbies. did we have this discussion already?