Fighting with family

Last night, my mom and dad decided that they wanted to have me pay rent. It's dumb founded that my dad decide to do this. It's like he never did this crap to my sister so why in the world is he doing to me.
Then my dad annouces that he doesn't care about me at all. That hurts really deeply to me. I get that i am not his favorite child and that's my sister. She's has a special relationship with my dad and that makes me mad. Why take it out on me?