How to convince parents to kick sister out?

[sieg]

so, here's the deal. My sister is a piece of shit. She does a bunch of drugs, is a raging slut, wakes everyone up a few times a week at 2-4am, gets herself into heaps of legal trouble, and totals cars. I can't stand her, and after telling you guys the person she is, i hope you understand why. None of that would really bother me though if she didn't bring other wastes of human life into my house every night. drug dealers, crackwhores, thieves, once she let someone in who stole my computer 2 consoles and all the games with them, totalling up to over $3500 in damages out of my pocket. But i'm not here to vent to you guys about how life sucks living in a hotel. I've been trying numerous times over the past few months to convince my parents to kick her out and to no avail. my mom is desperate to get her love back, and all my dad ever says is that she's a troubled soul or whatever. i don't buy into that shit, if she died tonight i would consider the problem solved. however, i dont ever see homicide as an option so maybe an overdose or something some day? Either way, my dad is drunk 90% of the time i see him and my mom is a stubborn person ( she also calls the shots around here)
So, in conclusion. any ideas on how to convince them to kick her out?
any way to convince her to move out? shes like 20
any advice to cope with this kind of stress? I've gotten more "evil" for lack of a better word, the past few months. and while it doesn't bother me a whole ton, it does so to my beloved. sorry for the long read and vent. i'm looking for advice, sympathize if you want. thank you in advance fellow teens. one last thing, calling CPS is a last resort. the living conditions are fantastic here besides the evil bitch. Well, thanks. i'll keep you guys updated as things play out.

[Silver Assassin]

Maybe steal something from your mom and dad, and put it in her room? Also, if things get any worse,.call cps. Sorry about your whore crackhead sister, I know how you feel:-(

[StoppingTime]

There's nothing you can really do to "convince" them to do anything. They're adults who make their own decisions.
You can talk to them all you want to, but in the end, they will only do what they want, and with what you said, it sounds like there is no way they will listen to you.
If you are concerned with your safety/security, then the police need to be notified. There isn't anything you can to on your own to change this "situation."

[Mortal Coil]

There is nothing you can do, as Steven pointed out, that will "convince" your parents to kick your sister out. She is their child as much as you are and, whether you like ot or not, they are in charge of the household.
However, you could and should tell the police if you are worried about more things getting stolen.

[FreeFall]

There's nothing you can really do to "convince" them to do anything. They're adults who make their own decisions.
You can talk to them all you want to, but in the end, they will only do what they want, and with what you said, it sounds like there is no way they will listen to you.
If you are concerned with your safety/security, then the police need to be notified. There isn't anything you can to on your own to change this "situation."
Basically this.

It sucks for you, all you can do is voice your concerns. I wish you luck!

[Jackerlus]

Sounds like she's messing up her life. Maybe you should call the police. I reckon you'll have plenty of evidence for her crimes since you live in the same house!