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I encountered this issue when claiming my granddaughter. Her father had already claimed her. To keep it simple, he did not provide more than half of her support. Parents are not married and he does not even live in the same state. When my taxes got rejected. I was asked to mail them in by TurboTax, but when I found out that he indeed claimed her, I removed her and sent the claim in thinking I could handle it afterwards. Can I still report him?