Yes. Only the court can decide if his efforts is not enough.
If the final divorce decree stipulates joint legal custody, neither parent can take the children out of state without the others permission.
No. You cannot do anything to interfere with the other parent's access to your children. You need to petition the court for permission to relocate.
In Michigan, the custodial parent can't move the kids more than 100 miles away from the other parent and can't go out of state, even for a vacation, without permission from the court
What can a father do if the mother of. His children took the kids and moved to another state without permission.
If without the permission of the parent or the courts.
Joint legal custody, no, not if the other parent objects. You must secure their permission or failing that, the permission of the court which is the only authority that may override a parent's objections in such a situation.
Not without permission from the court with agreement from the joint custodial parent.
Third years and older can go to Hogsmeade on the weekends, if they have permission from a parent or legal guardian.
Generally its intent is to take the kids and have 100% control.
With an injunction
migration
im assuming that there wasnt ever any custody case so no you dont need any permission. but if you or him have gone to court for any type of custody then you will need permission