Hi - my name is XXXXX XXXXX X'X a Family Law litigation attorney. Thanks for your question. I'll be glad to assist.
It is possible, but generally it is very difficult to reopen a divorce case. In order to have a chance, you must be able to prove fraud, misconduct, or mistaken negotiations, or by show a fundamental inequity or unfairness in the divorce agreement.
It is not enough to claim a mistake or allege that the divorce agreement was unfair. There must be hard proof that the divorce agreement was based on fraud, deceit or a major mistake.
It is possible that you could claim that the divorce settlement was inequitable and unfair due to this major asset not being divided. However, he is going to claim that you knew about the account and that you waived your right to claim any part of the account since you didn't ask for it initially.
Also, there's a statute of limitations issue (most statutes of limitation on issues like this are 2 years in Pennsylvania) and the rule that says a judgment is final after 1 year that you'll have to deal with.
Thus, it is not an easy task to pursue this, but it is possible. If you raise the issue with the court, your ex may be willing to settle on some amount to simply avoid protracted litigation.
If you're interested in pursuing this, you should consider speaking with a local attorney about the best way to approach your ex and the court.
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