My (16M) parents divorced 8 years ago. They have 50/50 custody, but since they live in the same city they let my brother (17M) and I choose where we go. Until this happened I spent most of my time with mom, but I'd spend most weekends and some weekdays with my dad.
Now the issue is that I had a girlfriend for two years until 6 months ago. My brother for whatever reason turned into an insane racist (we're white, my ex-GF is Puerto Rican) called her pretty much every slur in front of her, and to me. I don't blame her for leaving me, but I didn't let that go.
Our parents did punish him, they took his phone for a month and made us all do family therapy, that was it. As far as I care I'm an only child, the therapist tried to fix that by having one on one sessions with my brother and I, but I just didn't talk. I also haven't been to my moms place since.
My brother basically lives there full time now, since our dad wants to punish him some more. I basically told my mom she needs him out of there if she wants to see me. Either send him to boarding school (She can afford it) or military school, or our grandparents, get rid of him and then I'll visit. My mom won't do it, I don't know why she still cares about a racist, but she won't kick him out. My dad thinks I should just ignore him and go see her, but I'm not gonna stand in the same room as a racist.