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If there are no court orders restricting you to living within the state then you can move. However, you need to be aware that the move of a parent often causes the other parent to file for order or, if orders exist, a modification of those orders.
Moving to be closer to family is usually allowed but the court is going to want to the parents to reach some kind of agreement regarding the father continuing to have access to the child. In addition, if there are no order stating that the child is to live with you then if the father picks him up for a visit he can keep him and file for orders in the state where he lives for at least the next six months since the state you are in now will have jurisdiction untill the child has lived elsewhere for six months.
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