If you e-filed your return and it was rejected because your daughter had already been claimed on another return, then print your return and mail it in. (That is how you "report" your daughter's father.) The IRS will sort it out and determine which parent has the rightful claim. The loser will then get hit for any back taxes, penalties, and interest.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
