13 year old brother is shitty

I'm 17 and I have a younger brother who is 13 and he has the shittiest personality I have ever seen. He's an avid player of video games and I mean he plays video games all day. I dont know if this is some phase or what but the word n*gger, f*ggot, etc. Has become a Parr of his vocabulary. He says it to his friends and to strangers that he plays with online. I've tried telling him to stop because those aren't words he should say to anyone. But he doesnt listen and my parents don't care because my dad is racist and my mom just thinks its funny. For me its bothersome for obvious reasons. I hate being in the house with Him and idk what to do about him because nothing works on having him stop.