I HATE MY COUSINS! THERE TRYING TO MURDER ME!?

I have three cousins

Bart (Four years younger and has terrible grammar is really violent and stupid for his age)

Naddy (Talks WAY too much is a one year older and is stupid for her age)

Kev (Violent guy whose a month older than me and is the star of his soccer team. He gets angry because I'm stronger, faster and six inches taller than him. I'm also better at Soccer)

Kev once loosened my tooth while we were playing football when we were little I cried and skinned my knee and my jaw hurt for days, and then was surprised when I didn't want to play any game with him. But when I did recently I beat him even though he cheated and got angry and we fought for three hours (Not verbally because of his small vocabulary just physically) It wasn't exactly a fair fight because he's freakishly short and had one sibling who was a girl. Due to this he had never been in a fight before and wasn't prepared.

Bart whose from my mother's side had four girls for siblings yet he's a better fighter. He stole my watch once so when I wrestled it from him he started fake crying then I threw him out of my room and he ran for my door and It doesn't have a lock so I put myself against it and he couldn't get in so he started REALLY crying and I got in trouble. One time we were gong to the beach and Bart Punched his own SISTER in the Stomach six times and laughs so she threw him on the ground and He started Fake crying My Grandma came downstairs and told him to shut up because she knew he was faking it and she left. Bart always lies in front of Grandma so as soon as she leaves he stops crying looks around realizes that people see him faking and starts the alligator tears again.

Naddy, Kev and Bart live in a neighborhood with a high black population and they were visiting from there. My whole family is black an from there except me and my older brother when my family moved away from there. Over here everyone is white and there are few blacks and Asians. There aren't ANY Latino's. So I was talking about me getting in a fight at school because this kid stabbed me in the back (Literally) So I threw him in a garbage can. And then Naddy goes "Is this kid White because all of the white kids at my school act like that!" And then she monologues for A LONG time And I found that kind of racist but I say "Yes everyone's white here" Then she monologues.

What do I do about these awful people?