I was living with my ex on and off for years while I was trying to make ends meet by living with other friends. Because I was living with her she said I can claim her daughter as my niece since we wasn't married and I did. When I got my tax back i gave them money to shop and all, so the following year I stayed with her for a few more months and then I had to stop because I was also dating someone else and me and her started to get serious, actually we were planning on getting married. So now after a year and 1/2 shes now telling me to give her more money or shes going to report me to the IRS. I would like to know what should I do?