I'm going through the same thing, only I am on the other end. Regardles of whether they are moving to a large house with a maid and gardner, you are still their father? It does not matter who left who, or who was in the wrong, or who has the most money? it is your responsibility to provide towards their up bringing?? If your ex does not spend it in the correct amnor, then let tha lie on her concience? and you can feel proud that you are doing the honourable thing? keep records of how much you send, and how often, so as they acn see when they are old enough if need be, and in return, she should be making every effort to allow them to call you, write to you, send pictures and arrange to bring them back once a year, and allow you to come over to see them.