If someone else claimed your son and they already filed their return, you would then need to file a return on paper and claim your son. The IRS will process your return and send you your refund, in the normal time. Later on, you and the other person will receive a letter from the IRS, stating that your child was claimed on another return and it will ask you to amend your return if you made a mistake. If one of you doesn't file an amended return, unclaiming the child, the next letter, from the IRS, will require you to provide proof.
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