I agree that a lawyer handling paternity cases needs to be consulted. Typically arrears are vested interests in the payee once they become due, and there are deadlines for appeals and rehearings that may have passed. There are very limited and specific circumstances that could warrant "disestablishment" of paternity, but more facts would be needed. Good luck to your brother, either way.
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If he has four separate paternity cases against him, then he really needs to sit down with a family law attorney. Only an attorney with all the facts can adequately answer this question. He has options and there are motions that can potentially be filed.
It may be too late to contest paternity if he never answered the petitions and the petitioners received default judgments. However, they need to show he was served. If he was in federal prison at the time, it would not have been hard to find him. Service of process is just one of the issues, hence his need to meet with an attorney in person.
There are issues with what financials they used to calculate child support, etc.
Unfortunately, his issues are much too complicated and no one on here can even begin to adequately answer your question. The best advice he will get on here is to hire an attorney, but he does have options.
This is a family law question so I am changing the practice area to family for you.
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It sounds like he needs a family lawyer who handles paternity cases.
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