I am POA for my father, who is in assisted living. My Mother is in the same facility but in another wing since she has Dementia. Their home is empty ever since they moved to the nursing home. My nephew wants to buy the house at fair market value, but my father refuses to sign because he says wait until he dies. Obviously my father (nearly blind) is not thinking logically. As POA can I sign for my father? Does he have to have a psychological evaluation to prove he is incapable of making financial decisions?