My grandfather has Alzheimer's, and it got a lot worse this January when he caught pneumonia. He still mostly recognizes people, but he can't take care of himself. My grandmother can't take care of him either (for one thing, she's a foot shorter than he is - she had to leave him half on the floor when he fell out of bed, until the ambulance showed up), but even though she's said she'll consider an assisted living center, every time my father or one of his siblings makes an appointment to look at one, she either refuses to go, or drags her feet and then declares that she doesn't like it. (They also live on the opposite coast from us, so Dad flew out there for a while, but can't be there constantly, and he's the oldest child and I think she listens to him the most.)
It's incredibly stressful and I'm not even there. I'm also terrified that my father and my brother will get it at some point (my great-grandfather died of it).