If the children lived with you more than 6 months during that year then you are the entitled parent to claim them. You would just have to file through the mail claiming them and then a red flag will show up to the IRS that they were claimed twice and then they would send a letter out requesting the proof that the children lived with you for part of that year. Then the winner gets the money and the other parent has to pay back the irs. That is what I was told by the IRS when my ex husband claimed our daughter on his taxes without consent cause she lives with me full time.
