I have a 7 year old cousin, who's causing SO much trouble....?

Okay, so my cousin is about 7 or 8 years old. He recently started cussing. He called his older sister "*****" and his other older sister a "dumb ***". Last night, we (the 2 older sisters and me) were painting my uncle's house, and he came down. He started stressing us out by saying "I WANT TO PAINT" and screaming it at the top of his lungs. He would say it over and over, and when we tired to stop him, he would just scream "STOP" or "GO AWAY!". He also kicks, punches, elbows, pinches, and sticks his middle finger up at us. HE IS SO FRIGGIN IRRITATING. I can't stand him, and neither can his sisters. I know its bad to say, but we ALL hate him. I don't know what to do. he stresses us out so much, and he's 7 FRIGGIN YEARS OLD! What do i do? We can't stand him, we hate him so much (sorry if thts alittle.. harsh...but its true). HE'S SO FRIGGING ANNOYING!!!! What can i do, so he stops cussing, his violence, and just plain old annoying?