Your case does not belong in small claims court. Consult with a local matrimonial attorney as soon as possible.
The answer likely depends on the specific language in the agreement/judgment of divorce. Consult with a matrimonial lawyer.
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This is a divorce related question, not really a debt question. The issue remains under the jurisdiction of the family court, so you would not go to small claims or any other court. Before you can reduce the amount owed to a judgement in your favor, the other party must default the terms of the divorce decree. If the decree says the ex must pay $X amount from sale of house, and the house has yet to sell, not sure you have a mature claim.
Yes on the judgment, but not small claims court - the post judgment part in the court in which your judgment of divorce was issued.
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