If someone one has claimed your dependent and was not supposed to, you will need to print and mail your return into the IRS and/or your state. You will be able to claim your dependent on your printed and mailed in return. Once the IRS and/or your state has received your return they will then process your return and catch that your dependent's social security has already been claimed.
They will then request information from you and other person who has claimed your dependent for proof that you are the one who is entitled to claim him. Please send in what they ask for as soon as you can.
They will make a determination based on the evidence that was sent in and adjust the returns accordingly.
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