Tell her that Santa arrives at your house with your money, and her hous ewith her money, and if she's not saved up enough over the year from teh child support, you hope she'll be able to make it up for herself otherwise, because she no longer gets to pretend to be generous with the kids on your dime. That's for YOUR generousity to decide how to spend, and watch the kids' reactions as they open the gifts you pay for!