My sister is having our competent 90 y dad sign POA her a primary and me secondary. She was POA for our aunt who died a few years ago, I never saw a copy of will and she took all monies and sold the house for a tidy sum, stating “she deserved it all.” So I am burned and very cautious this time. Is there anything legally I can do to prevent this from happening again? I do have a copy of my dads will. FYI She is having the same lawyer draw up POA papers.