There is no way to stop someone from claiming your children on their taxes. You could file as soon as possible to have your return received first by the IRS.
If you file electronically and your return is rejected because your dependents have already been claimed, then you can file a paper return to claim the kids.
The IRS will review your information and determine who should be claiming the children. This may take several months for everything to be worked out, but it may be what you need to do if someone else filed first and claimed your children.
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