am i out of line?

[Andromeda18_]

I am a 21 year old college student living at home with my mother, 18 year old sister, and her 19 year old boyfriend. I am really sick of this guy, he puts his nose in family buisness, and gets too comferatable in our house (keep in mind this is a 2 bedroom tiny house) He shares a room with my sister, while my mother sleeps in the livingroom. He makes around 1000 a month and has full beniftes where he works...he has been living with us for 5 months now. the reason he moved in in the first place was because he was thrown out of his house (his landlord was a dick, and it wasnt to any fault of his own)

What i want to know, is should this guy move out...he has more then enough money to live by himself...but every tim i bring this up to my mother she asks why its so important that he leaves....i keep reminding her that its important to me because we hav'nt gone more then six months without "taking in a stray"...yes we might as well be a motel 6, then she comes around and call me a "selfish jerk" for wanting him out, and that it would make my sister unhappy...my sister that isnt ready to move out, but is aparently ready for an adult relationship...It might just be me, but i actually think she would preffer him there over me. oh and by the way, my brother is homeless, but my mom wont take him in because she is trying to teach him indepenance...WTF is that, if i have to share my house with anyone, it should be my brother who actually needs a place to stay...

I will be looking for a new place soon, because i cant stand the living conditions here...to me this is one of those things that will make me resent my family for a long while

Personaly, I don't think you're one bit out of line. If I were in your place I think I would've freaked out a long time ago. I'd probably do something extreme like what Vicious suggested, just to piss them off, then again I have a bit of a temper so...
If there's one thing I like is my privacy and living in a small house with a stranger that keeps poking his nose in other people's business would truly set me off. I mean, I don't like it when people go into my room without asking, I suppose I'm quite territorial.
On the other hand it is nice of your mother to take in someone who was thrown out his house, but not for 5 months!!! And not when he has enough money to live by himself!!! And it really doesn't make any sense that your mother's trying to teach your brother a lesson and then does the exact opposite with some other guy.
If you can afford to move out and help your brother then you should do so.