Mailed tax returns are processed differently than e-filed returns. Since someone else already put your child's SSN into the system, you were unable to e-file. The IRS will process your return that claims your child and you should receive the refund based on the information on that mailed return. It may take up to a year, but the IRS will eventually sort out the duplicate use of the child's SSN. The person who incorrectly claimed the child will face repayment of child-related credits plus penalties.
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