The people who live in my house are so annoying?

In my house, there is my mom, my little sister, and two family friends. Which are a mom and a son. The son is a year older than me. He's 16 and I'm 15 and my little sister is 12. They live in my house so the son can go to school because where they normally live, the schools are horrible. The mom and son sleep in my little sister's room, I have my own room, and my little sister sleeps with my mom. The son and I do sports, he does winter track and I'm on the swim team. Everyday his mom picks us up from school and her car is just messy and there's food everywhere and I can't stand it. All she does is complain about her work (she works in a factory, so it's just labor work) and complains about the drivers around us and screams about their race. Yes, she's racist. I am so annoyed with her hatred towards people that I call friends so I started taking the after school bus because she complains about me being late when it's her son that ALWAYS leaves his practices early. So to stop causing her to scream at me, I just took my own way. Now, my mom usually comes home late because she's a lawyer and always has to talk her to clients, so the family friend mom cooks for us. When she cooks, she always leaves a mess and yells at me if I don't eat the food. I just tell her that I'm not hungry and she calls me an ungrateful brat. Then she slanders the people I hang out with and says that I'm a bad person because I have friends of different races. I just ignore her and go to my room. We own a dog, too. He sleeps in his crate and the family friend mom wakes up around 4am to leave for work, then he starts barking like crazy. She doesn't even make an effort to open the crate for the dog. All she has to do is open the door and let him out. Well, surprise, she doesn't. AND on Fridays, my mom and I have cleaning days when she's off from work and the son never does anything. He eats, sleeps, and trashes the house. I ask him to brush the dog's teeth while I'm cleaning the kitchen floors and he complains that it's MY dog and I should do it. So instead, I told him to get my little sister. He goes "She doesn't have a cellphone, she's outside, so no." I yelled at him for being lazy and told him to lock himself in his room if he's not going to do anything. He leaves his stuff in the living room and I tell him to take it up with him but he ignores me and walks upstairs. What the hell? I swear, I am going to beat him up. I am so close to punching him. I've talked to my mom about them and she agrees but she's not going to kick them out because they're family friends. They have a house of their own but they live in mine! If the son is such a tough boy why doesn't he just take on the bad schools, then? If they're not leaving, then how do I deal with them? The mom complains about how other races are lazy and messy when herself and her family are doing what she's explaining. I can't take it anymore. What do I do before I seriously beat someone up?