Power of attorney question

[forgop]

Originally Posted by bobarian

Depending on the laws in your state it will probably be necessary to file a form revoking the previous POA.

I figure that's a given, but I'm curious if it can be done without the "consent" of my gpa should my uncle try to go through with it. My aunt was kicked out of the hospital for her actions on drugs and nobody wants her to have any legal authority to decide anything with regards to his health or financial matters.