It sounds like no court has ever entered an order specifying who gets custody and who should pay child support. In the absence of a court order, both parents are free to conduct themselves in whatever manner they choose. If a court order has been entered, then whatever changes are to be made ought to be made by court order, no matter whether the order is entered by consent or after a contested hearing.
Answered on Jan 04th, 2013 at 6:48 AM