I do have a very good Son, who has 3 children under 4. They have their hands full, but it was by their own choices. They manage money well and have only had to ask me to help a few times over the last 5 years, when something comes up. They pay their day to day expenses, but have no extra to put away for an emergency. I've paid for a washer/dryer repair, some medical bills for the kids, medicine, etc. Necessities, not excessive stuff. I give it to them as gifts, with no payment expected because I know they can't afford it. Now, Son asked me one day about borrowing some money. When I asked what it was for, he said he wanted to buy DIL a nice gift for her Birthday. I told him that I would be happy to do it for him, but this one was not a gift. I had already bought her a gift. This one would have to be repaid. And, there would be no more "gifts" of money for necessities until it was paid back. He agreed and bless him, paid me back $20, every other week until he paid it.
So even though I have a good Son, who is responsible, I still set my limits with him on things. I still want him to know that I will help him, but he has to make wise choices. They also know that if I "gift" them something they can't afford that is a necessity, I better not see them out to eat the next day at a restaurant. That would be the end of that too.