I feel you there, I have one living grandparent, but I've been down that road with untrained family insisting they could care for someone with basic needs that would tax a well organized care home.
Well, a good home is around $300-400 a week, and they have no money.
IDK...her 50+ y.o. doctor thinks she's fine and won't sign off on her medically so the state or SS can't help either.
They think they can handle it...I know better as I worked in-home care for COPES decades ago. It was rough as hell.