Ok. Basically, the father would need to file in New Jersey to modify the support order unless you submitted to the jurisdiction of the Georgia courts.
If you filed to modify the support order, however, you might need to file in Georgia. The reason I say might is because it is unclear from the facts you've provided whether or not, when you registered the North Carolina order in New Jersey, whether the father submitted to jurisdiction there.
In UIFSA (Uniform Interestate Family Support Act) cases, there is effectively three jurisdictional items that need to be achieved to modify a support order when no one resides in the original state.
First, no one can reside in the original state.
Second, the order must be registered in the state where it is going to be modified. (For you, it would need to be registered in GA so it could be enforced against the father there unless the father already submitted to the jurisdiction of the NJ courts... For the father, it would need to be registered in NJ to be enforced against you...).
Third, the courts must have personal jurisdiction over both parties. This typically means that the party attempting to modify the order submits to jurisdiction by filing for modification out of state and that the party responding to the modification lives in the state. There are other grounds for jurisdiction, however, which are listed in the below referenced Georgia statute:19-11-110. Jurisdiction
In a proceeding to establish, enforce, or modify a support order or to determine parentage, a tribunal of this state may exercise personal jurisdiction over a nonresident individual or the individual's guardian or conservator if:
(1) The individual is personally served with process within Georgia;
(2) The individual submits to the jurisdiction of Georgia by consent, by entering a general appearance, or by filing a responsive document having the effect of waiving any contest to personal jurisdiction;
(3) The individual resided with the child in Georgia;
(4) The individual resided in Georgia and provided prenatal expenses or support for the child;
(5) The child resides in Georgia as a result of the acts or directives of the individual;
(6) The individual engaged in sexual intercourse in Georgia and the child may have been conceived by that act of intercourse;
(7) The individual asserted parentage in the putative father registry maintained in this state by the Department of Human Resources; or
(8) There is any other basis consistent with the Constitutions of Georgia and the United States for the exercise of personal jurisdiction.
Again, I'm sorry about misreading your question before and I wish you the best of luck in your situation.
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