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First, if you are finding that tax returns that were filed jointly with your name are inaccurate and you had no knowledge, you need to get to a local tax professional and file an Innocent Spouse form where you sign an affidavit regarding your lack of knowledge of what was filed. At the same time you would file a complaint about the false tax reports.
Second, if he did not disclose all of this in the divorce, this is grounds to return to court to file a motion to re-open the marital property
settlement based on his fraud and the court will open the marital property portion of the case and you would go through all of the assets concealed during the divorce and the court would issue you an adjusted property settlement award, plus it is more likely than not the court will make him pay for your attorney's fees based on him committing fraud in the initial claim. Furthermore, this would likely be cause to get any new claims against you dismissed, including his new claim for custody.
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