I have court papers showing that I have full and sole custody of my son and that he was with me like 99% of the year. I let my son's father have him a few weekends last year but only a handful.
My son's father told his brother that he should claim my son as a tax deduction and he did.
This happened last year too. My son's father filed taxes before I did and then when I filed my taxes and claimed my son as a dependent I was told by the IRS that my son had already been claimed (although last year it was the father claiming him - not the brother).
How can I dispute this?