If you can get them to sign it you need 2 poa’s. A regular one and a medical poa. Good luck. I couldn’t get my mom to sign one and boy did we pay for it. She was very difficult. Eventually she wound up in the hospital and we talked the doctor into not releasing her except to a rehab facility. The people there and hospice who we used for skin care talked the main doctor there into declaring her incompetent so we could finally start making decisions. Til that point she made all the decisions, always wrong, and I had to come along and clean up the messes she made.
It’s never easy. Good luck.
Trying to get my dad to do this now. He still lives on his own all the way on the other side of the country.
It’s hard to help when they won’t let you.