you could call the IRS but there may be nothing they can do except to tell you to file by mail and include form 14039. they will not tell you the name of the other party that claimed your child even if it is your child. are you sure your child didn't submit a return, because if you are sure then file form 14039 with your return. sometimes it's not identity theft just carelessness by another individual who mistypes a SSN.
