Family Law Questions? Ask a Family Lawyer Online.
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Unless there is a court order setting out who is the custodial parent, his visitation rights and child support, there's really no way to stop his access to the child because there's no court order restricting that access.
I would recommend that you file a petition for custody and child support to be determined as soon as possible to prevent him from taking the child.
You will have to file a petition with the court for custody and visitation. The court clerk's office may have the necessary forms in its office or online.
If not, you will likely need legal assistance to get this done.