I hate my parents

My mom has 2 kids, and it was only supposed to be 1. My non biological older brother is severely disabled, and my mom found out that I was a miracle baby, and that she couldn't have any more kids. My older brother doesn't speak, he can't walk, he can't do any basic functions, he's unable to take care of himself, and he's had 2 heart attacks and a massive stroke at 25 for fuck sakes. If that's not proof that the common "evolution" theory is a crock of shit I don't know what is. And yet, he gets to just live off of the government with my mom driving him to a job he doesn't actually do for minimum wage, and they've made it so I have to give them my tax filings for their disability checks. It's bullshit. When I was 4, I got a dog that I still have now and I love more than anything. I'm now an adult and they're living with me and my fiance. They don't pay rent or utilities or do anything to help around the house, because "I don't have a real job". I don't have a real job because I had to drop out of college to take care of my brother and dog. I don't have a drivers license because of the same reason. I don't have any friends because I've never had the chance to meet new people. I keep to myself most of the time, and I'm off the grid so to say. I still make good money, I travel, I have pets, and I have a decent life. But my mom and *my brother* have murdered my dog. They let him out and he was hit by a car. I don't know how they couldn't see that, they were fucking there. But apparently they didn't notice. And my mom is telling me that I don't get to go buy a new dog, because he was the last one that I'll have. I can't even look at her, but they're refusing to move out because they think I'll kill myself if they're not there. I don't know what to do. I hate them. I want them dead. I don't want them in my life anymore. I don't want to see them again. I don't know how to throw them out.