Mothers typically treat child support like an extra income stream, to be controlled and maximized at will. Yes, she can make him do pretty much whatever she wants because she knows a judge will likely side with her. I'm sorry you have a boyfriend with an ex-wife, because his financial life is controlled by the mother and likely his and your best interests are not very high on her priorities. In fact, the opposite is quite likely true.

Shelby: What is in the divorce agreement about this? If it is not addressed or what is in the agreement is not being followed, these questions need to go back to a Lawyer(s)/court/Judge, in that order.