my ex claimed our son on his taxes this year. he's had him a total of about 1.5 months out of the year by himself last year, and i've had my son 5.5months out of the year, the rest of the year, we were together. according to the IRS website, he had no right to claim him, i did, but my taxes just got denied. i know i need to appeal it, but how do i appeal it, what kind of documentation is needed, and what are my next steps? i can't ever seem to get through to the IRS to ask these questions.