File your return correctly claiming your child in accordance to the court order. You will need to file a paper return.
The IRS will process your return and send you your refund, in the normal time. You will receive a letter from the IRS, stating that your child was claimed on another return, telling you that if you made a mistake to file an amended return and if you didn't make a mistake to do nothing.
The other party will get the same letter you did. 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. Be sure to reply in a timely manner.
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