If your children won the lottery or came in to a large amount of money would you expect them to give you money or pay some bills for you?
I would pay everything for my mom if I had the money. She would never ever demand or expect it. Now, my father who has never really been a dad thinks I should give him 50% just for the fact that he is my dad. I wouldn't give him a dime.
I would not expect my children to give me money, though I'd appreciate it :D