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There is no statute of limitations for enforcing collection of child support in Oklahoma (assuming this is where the order was from). See 43 O.S., Section 137 B.1 and 12 O.S., Section 95(9).
However, the problem is that only the parent that was supposed to receive it can enforce it. The child cannot. So if the mother has passed, I am afraid that this issue is now moot. I am very sorry.
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