help get this whole thing with my grandparents and aunt straightened out before it's way too late

my aunt is a selfish bitch and she made my grandmother sign a paper that gives my aunt power of attorney over everything, both my grandparents and everything they own, instead of what my grandmother thought she was signing, giving my grandmother power of attorney over my grandfather…who is that deceitful? who does that to their own parents….a selfish bitch that’s who….we tried to get it all settled by buying new papers and redoing it, but then we found out it has to be the same exact paper my aunt had my grandmother sign, so now we have to find that one…:( I hope we get this taken care of by the family reunion….