My grandma wanted to make me her POA, so, I took her to an attorney that deals with ‘family law’ (the same attorney that wrote up her will, handled mom’s divorces, mom’s will, etc.), and he took her into his office, and spoke with her privately, and then he drew up the POA stuff, she signed it, I signed it, and all is taken care of.
She also has Alzheimer’s.
The attorney should speak to him privately, to make sure that he’s not doing the POA thing if he really doesn’t want to do it, I’d imagine.
Good luck!
I’ve been going through something similar, albeit I’m in the U.K. You should get a doctor to certify that he is currently of sufficiently sound mind to sign.