Can anyone help me find options?

My parents and I care for my great grandfather. We want him out. We can't afford to put him in a home, he doesn't qualify for Medicaid but is on medicare. My thoughts go to ward of the state, however my parents currently hold POA and I'm not finding anything helpful online so far. He isn't quite senile. Mostly just pretends to be more incompetent than he is. None of his other family members will take him, partly because they also hate him, partly because theres no money in it for them. I don't know where to go from here.