You should be discussing this new information with your attorney--THAT person knows all the case facts, all the history, all the evidence and THAT person is best suited to address the very specific nature of your question.
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If the information could have been discovered prior to the trial, it is unlikely that the belated discovery of the information will serve as a basis to attack the judgment.
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You are in a difficult position. If this is information you could have discovery with due diligence prior to the trial, it will be difficult to do anything? I would ask for a new hearing based on a change in financial circumstance of the other person and ask for more support. You will need to be able to lay a proper foundation to establish the documents are genuine and trustworthy. Talk to your attorney about this issue and follow their advice.
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If you have admissible evidence that showed the other side lied in its disclosure papers, and the court relied on those wrong numbers in setting support, you can seek a modification. Talk to your atty to see if you can get the proof in a form acceptable to the court. Hopefully the judge will be more angry at the lying party than at you for not getting the evidence before.
A motion for rehearing is possible, although from the fact you have recited it seems unlikely to be granted.
Talk to your lawyer about this!
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