Yes, if there was an injunction he would have been served and notified of a court hearing regarding the injunction. Although a temporary injunction can be issued without a court order, he would need to be served and given a court date for a formal hearing. Further, if they have agreed to issues regarding custody and visitation, those would then to be changed if there is an injunction in place.
As to relocation, unless both parents agree or the court approves, she cannot just pick up and move to another state as that impacts the father's rights to any share custody or visitation arrangements. Generally a parent wanting to move would need to petition the court for approval and would have to change the parenting arrangements or else they would be in contempt of court.
I would agree that he not sign anything without verifying the status of this injunction and relocation. He should carefully review his divorce papers or any settlement agreements he may have to make sure he is not agreeing to any relocation or request for injunctions in those papers.
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