Family or loneliness?

I have a family member who is used by her children. Yes we all have family that we rely on sometimes. I rely on my mom babysitting my children. My children love her and they have a relationship I never had the chance to have with my grandmothers who both didn't live in the US. I feel bad for my family member I don't know why she let's her children and grandchildren use her. She's getting older in a few more years somebody will have to probably take care of her and I don't see her selfish kids helping her. They don't help her now why would they later? All they do is ask for things money, money, and more money. They all work but it's never enough she's always having to help them all the time. She's helped buy them homes and other big things. I asked her once why are you helping your kids so much they are soooooo grown up and need to do it on their own if they aren't living with in their means then they need to start, not ask you for money. She told it was because she felt bad for them. It's upsetting to see how much effort and sacrifice she does for these ungrateful brats she keeps funding. She's in a denial of some sort as well. In her eyes her non of them are much need of a psychiatric evaluation or drug users. To her they are are perfect even when they totally disrespect her they are perfect. I hope one day she opens her eyes and notices that it's time to focus on herself and not worry if her 40 something year old child can pay a bill. We all worry about our kids and yes they are our babies but there has to be a line somewhere. When I'm nearing my 70's my kids better be able to lead lives were they can pay to live the lifestyle they pick. If anybody is taking care of anybody I would hope it would be my kids helping me since social security may not be around by then. I think she needs to read this book.