The Uniform Interstate Family Support Act (located at the blue link below) deals with modification (which includes overturning) orders addressing both spousal and child support orders. Basically, under the Act, so long as one party remains in the state that issued the original order, that state retains the jurisdiction to modify it as the "home state". If all parties involved have left the home state, that state may not be able to modify the support amount. Rather, to modify the order, the order must be registered in the state of residence of the parent who is not seeking modification. However, under the Act, the modifying state cannot change the duration of the order- they can only address the amount.
So in sum, if one party (adult, child) remains in the home state, that state retains jurisdiction and a different state does not have jurisdiction to modify the order.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.