This is really a matter for the custodial parent (i.e. your mother) to pursue on your behalf. Absent her being unavailable, you really should leave it to her to pursue as she is a party to the litigation (within which the child support obligation was set) and you are not.
The Answer provided was based on the limited information provided, and represents information based on the law in general, not a legal opinion that can be relied upon. Before a formal legal opinion can be offered I would need an opportunity to review all possible relevant facts and circumstances.
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I agree with the other answer. The CS was intended as a contribution toward expenses your mom was paying on your behalf - a portion of the rent or mortgage, food, utilities, transportation, etc.
Your mom would have to file the motion, but the court would enforce the CS order and make him pay arrears.
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The above is said without seeing your case file and without my understanding the entirety of the facts of your case. Depending on those facts, the above information be may incomplete or may be completely inaccurate. The above is intended as general information only based on what you described and not as legal advice. I advise you to consult with counsel who may be able to provide better information commensurate with a better understanding of your situation.
I agree with both Kenneth and David. Leave it to your mom to enforce the support award.
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