I think that people are piling on a bit here. The OP has said, as I understand it, that her daughter will probably want to spend a roughly equal amount on each of her parents, and far from 'expecting expensive presents' is actually wanting to save her daughter some money.
I wouldn't count the cost of presents to the penny, but neither would I spend a fiver on one child and a hundred pounds on the other, and I don't think many people would. I would feel the same if my parents were both here to buy for, so I think I do understand where the OP is coming from. She can correct me if I'm wrong, but I get the impression that she was a bit upset when writing the first post, so maybe that hasn't come across as clearly as it may have done.