People do what they can personally cope with in situations like this.
When I was a child, we had two grandads live with us and didn’t question whatever needed to be done.
As a young wife with two small children, we had a great grandad live with us who needed very personal care. We just got on with it, wasn’t easy but we did it.
With teenage children, we had a very ill relative live with us till they died. Very difficult, very, but we did it because we could.
Not everyone can, and no one should be judged or criticised if they can’t.