Only tangentially related but, speaking of taking care of people in their old age, my mother is taking care of my step father and she's clearly not happy about

Only tangentially related but, speaking of taking care of people in their old age, my mother is taking care of my step father and she's clearly not happy about it. She's only got one life to live and she's stuck staying at home with him until he dies or at least that's seems to be how she feels. Maybe to be put it another way she can't get herself to check him into an old folks home and effectively leave him so she can enjoy the last few years of her own life while she's still able to. She's healthy enough she could travel and do things that she want's but feels she has to stay put until he passes. That could be tomorrow or 5 years from now. 8 years ago they said he had 3 years to live. That doesn't mean she doesn't love him but she does feel somewhat trapped. I suppose my sister and I could help her and volunteer to watch over him for a week or two at a time though neither of us have jobs that would let us do that. But also, she married this man after we were both adults so while we like him as a person we feel no obligation like we might if he was our father or even the step father that raised us. Instead to us he's basically our mom's boyfriend. It does make me think what I would do if I was him. Would I be self aware enough to check myself into an old folks home to let my wife or kids not have to take care of me? I believe I'd personally feel horrible by restricting the life of my loved ones. I'm sure I'd also feel horrible if they all abandoned me. I don't know which is worse. My currently healthy self wants to believe I'd value their freedom over my needs but my, future "old and needs constant care" self will probably feel different.