Your question presents some tricky legal points regarding jurisdiction of the Court. You should have an attorney review the California orders to determine if California retained jurisdiction on custody. Under California law, you can always seek orders modifying custody and support so that your "waiver" is not forever. California courts often retain jurisdiction to determine future custody issues in a child relocation case. For these reasons, you need to consult a California attorney.to review the actual orders entered by the Court.
The above is general information only. It should not be considered as legal advice applicable to your specific circumstance. Reliable legal advice applicable to your situation cannot be given without a consultation. The above response does not create an attorney client relationship nor should it be considered as a privileged attorney client communication.
There is a set of laws called the "Uniform Interstate Family Support Act" that has been adopted by all 50 states in one form or another. What that Act can be summarized to mean that as long as one of the parents remains in the "Initiating State" (California for your case) then that state has "continuing exclusive jurisdiction" to make decisions about child support. Since your Ex still lives in California any changes to child support would be heard here in California. While you CAN waive your right to receive spousal support forever, you CAN NOT waive your right to receive child support. If there has been a change of financial circumstances then you should seek assistance in filing a Request for Order to modify child support in the original (California) court. You should consider contacting your new State's Department of Child Support Services to start interstate assistance and enforcement of your child support.
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