What to do?

So.. my boyfriend M(34) and I F(30) are taking care of his dad M(69). Since January of 2021 my boyfriend's dad Dennis has been in and out of the hospital. He goes in and refuses help, he is mean to the nurses, rude, and complains about going home. He has been going in for acute kidney failure. He has had a surgery on his foot due to his inflammation, he got sent to a rehab facility where he was staying in until he could walk. He got himself kicked out for not doing his PT, for being rude, for constantly bantering about beer. He is an alcoholic, he now is home living by himself. He refuses to leave his home but has fallen everyday he had been home. We can't get him up sometimes but he fights with us about calling the ambulance. We find him on the floor soiled so my boyfriend cleans him up and begs him to get help but he refuses. Since he can't drink his beer her doesn't want it. Also he also abuses pills.. we are at our witts end. We don't know what to do. He doesn't want to make his only son his power of attorney. So we are all he has. If someone could give me some pointers because we are broken, dumbfounded, angry, frustrated. He is consuming out lives and I'm afraid for my relationship with his son will take the brunt of all this.. thanks in advanced.