This is a common difficult question to answer. One always must be careful when you contemplate NOT obeying the court's orders. But, if the other parent does NOT tell you where she is living, it may be a basis to not allow the child to go on the visit. But, to be sure, look at any court orders to see if that is an included provision. Again, if you withhold the child from the mother, then you take a chance that you could find yourself in court answering to the judge as to why you are keeping the child from the other parent. So, before YOU decide what to do, be sure. Also, you may consider speaking with a local qualified family law attorney to discuss rather or not the orders will need to changed. Good luck!