You should file a petition for downward modification in the Family Court. The court will want to look at any reduction of income and significant increase in expenses since the time of the last order. They will want to see whether you are collecting Social Security Disability and whether you receive any other income from working. You should also bring your foreclosure papers with you. It is very unlikely that the court will terminate child support, however if your income has gone down substantially since the last court order, you may be entitled to have your child support lowered.
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You should post this in the Real Estate secion. Also check what help me available from charitable organizations.
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This advice is not meant to create an attorney-client relationship and is a general anwer to the question posed.