What can I do if my ex-husband will not tell me where he is taking my kids for his parent time and overnights?

This is a difficult question to answer. Technically, no lawyer can advise you not to provide parenting time because it is inappropriate to deny the other parent contact with your child and a court will consider that self-help and a violation of any parenting time order.

You should file a motion and asked the judge to order him to provide this information. Additionally, you should request in the order that all future parenting time be denied until you receive that information and he continues to updated as it changes. But do not deny any parenting time until the judge signs that order that you filed with the motion.