Moving without my mom?

Im 11 and my mom and dad sPlit 4 or 5 yrs ago.now she has a bf that i hate. He is rlly annoying. So my dad wants we with hom i wana but dont wana leave my mommy. i love em both. But i rlly miss my dad... My other family is in the same city with him. Ps my step sis n i dont get along very well. Only when we r on tha phone we luv each other like we bin real sissters. (im not sbelling rite cuz im hungry). Pss how do u pick someone for best answer psss help my other ?