How should I handle my cousins very long when they're driving me crazy?

My cousins have been here for over a year and they’re both driving me freaking crazy!!! My dogs hate my cousin and whenever he comes around,they just have to bark every time and it’s sooo annoying!!!! Some people think he’s mental or crazy or something :O.Then my other cousin is such a bitch! We’re in a big fight and omg I’ve never seen her like this before,she’s a brat! My parents are getting sick of them but they don’t want to hurt their feelings and my mom and my aunt fight alot and it just bugs me! It’s like a living hell in our house!!!! I have no idea what to do!!! I have no idea when they will be out of my life!
Help?