Both my parents have said that they will move into a home if it's necessary.
Early 70s, with ill health but can just about manage (and I do what I can, DBro lives overseas).
My parents looked after my maternal grandad for years. He was an entitled sod, just expected it to happen as his due, and the stress of this contributed significantly to the poor health both my parents have now.
DBro and I supported our parents as best we could, although we were teenagers. While my Mum's 4 siblings did bugger all and left it all to mum and dad, making a great fuss if they came round and changed Grandad's bedding.
Yes, years later I'm still somewhat bitter towards them, they did know about the chest pains my mum got, that were eventually diagnosed as stress, after ECG tests, etc, they knew about the poor health, my dad's heart bypass operation, and so on. And did nothing.
In fact, they protested when my parents eventually managed to get SS to move grandad into a home. They had to explicitly make him homeless by refusing to allow him back to the house when he'd gone into hospital for yet another UTI (a SW actually advised them to do this, off the record).
They cared for my grandad, but their own health was so poor that if my grandad fell, they had to call an ambulance to help them get him up. The home was a massive improvement for my grandad's health, and also my parents health, and should have been arranged years before.
So, those of you talking about how family is supposed to care for each other, well, you've probably never had to deal with the kind of unrelenting slog my parents had.
You need to have the conversation with your family, discuss your expectations, and also listen to what your children might have to say about what they feel they can provide. Don't expect a DIL to want any part of your care, she'll most likely be saving her efforts for her own parents. And remember, that family relationship can often be much better if your children are not also acting as your intimate 24/7 carer. Be realistic. These days many people can't just give up work as they need the money to pay bills, etc.