Each month we are finding errors in my 84 year old dad's checking account. He is leaving Pay to the order of line blank and then can't remember what the check was for. He puts one amount in the box on the check and another amount on the line, thusly shorting the company of the monthly bill. He has been late on bills. I have DPOA but Ameriprise investments won't recognize it without a doctor activating the medical POA, of which I am also his agent. My dad fails every memory test at each doctor appointment, yet the doctor has not yet activated it. My dad refuses to give me control voluntarily. He gets belligerent if I even suggest that I help him. When I confront him with the errors, he says "So I made a boo boo. Big deal" He is on a limited income, yet gives to any charity that asks. He has given me no money, but lied about sending $14,000 to a granddaughter who he hasn't seen in 20 years. How do I get the doctor to activate the medical POA so my dad can't fight me on this? He was diagnosed with dementia two years ago.