You should consult with experienced legal counsel in your jurisdiction. It would likely depend upon a variety of factors including whether he had the inheritance at the time of the divorce but did not disclose it to the Court, whether you have been awarded alimony etc.
Is this divorce still pending? You have not signed anything yet, right? I disagree with the answer below because Indiana does not have alimony. Indiana is a state with a rebuttable presumption of a 50/50 split of marital assets. If the inheritance was during the marriage, and prior to the dissolution filing, it is considered a marital asset with some caveats. Because it is inheritance, he can ask for a deviation from the 50/50 split. The court will look to other factors, such as thr length of the marriage. You should consult an experienced divorce attorney practicing in Indiana, especially before you sign.anything. Best wishes to you.
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