Is it normal to have a sociopathic sister?

I hate how people are saying this isn't true. There really are people out there like this. Dude, get her help.

I can't tell if this is true or not. But clearly you have a negative image of your sister in your mind. To you she does completely horrible and terrible things. I think that if you try to look past the mental image that you have for her, you might see that everything she does isn't that bad. I know from personal experience that I thought that my younger brother was the worst person in the world. But I got over the horrible things that he did to me in the past and I found that he wasn't such a bad person, and that we actually get along pretty well. Now I'm not saying to become best friends with your sister, but maybe try to see her from a positive light, instead of a bad one.

shoot her in the face. she will never contribute to humanity.

Yes. Lots of siblings are like exact opposites. I think this is especially common in twins.

Dude, very simple solution! fight fire with fire!!! go in that room when she's not there and grab her computer/laptop!!! hide it.
then I dont know if it is possible but get a second hand piece of shit that looks remotely like hers(same color) and proceed to beat the shit out of that thing into pieces and leave it lying there with a note that says.."not cool being thrown against a wall is it" your cat will thank you bad back and all and she might just get the fright of her fucking life that you have destroyed everything she has!!
Be vigilant and be serious!! go fucking crazy while bashin the fuck out that machine!! when you feel she is sorry present her laptop- after deleting everysingle fucking file on that thing!!!! her happiness will quickly turn to realization that she is just another speck of dust like we all are on this planet!!..
Put the little bitch in her place quicktime!!!!
Peace!

i believe u cuz unfortunately i use to be like this until i got into my 20's... she may not be a sociopath but she does have issues. I was a compulsive liar and i was very sneaky and manipulative with my parents i started writing their bank checks at 15 go figure. I was the only girl out of 4 boys and would steal my bro's stuff all the time. I admittedly had but one of are cats in the dryer but only for like 3sec....of course i know this soo insanely bad. This is in the past and I am in my mid 20's now. All i know is i dealt with verbal and physical abuse from my mother. And it was my mother who i loved more than anything at the time. It was a sick twisted thing. I did not feel loved as a child. I was always craving attention. I am so happy i grew up and found God. He saved me from everything.

I am your sister.
And MissSorel. And NinjaAssasin and Trismegistus and NeuroNeptunium and EVERYONE.

I own all these profiles, and if you don't log off and stop bothering me on IIN, I'll tell mom.

Volunteer to go to a psychiatrist next time she says you're mentally ill. Unfortunately the only thing you can do is to be supportive & loving to your parents until they figure it out for themselves. Or you could call Child Protective Services (or whatever its called where you live) & explain the problem, see if they can do anything. Or, if you have documentation of a stolen item (like your receipt for some jewelry, and a record of sale from her eBay account for the same jewelry), LEAVE IT WHERE IT IS, call the police, give them access to her computer. Definitely would not be popular in your family, but it is one way of getting her help.

She's probably not a sociopath, just neglected. Therapy is a very useful ever-present tool.

Your sister is displaying a lot of symptoms of Conduct Disorder, which is essentially a prerequisite to Antisocial Personality Disorder-- i.e. Psychopathy. The most telling part is injuring animals. It's quite unfortunate that your parents aren't seeming to take any initiative to get her treated; though, even if they did there aren't any effective treatments if she WERE to have Conduct Disorder. My advice to you? Perhaps you yourself should be seeing a psychotherapist in order to help you cope with the issues within your family. You need to worry about how YOU are dealing with this. If you don't have much of a relationship with your sister and cannot offer her any kind of guidence as a mentor through your relationship, then you need to focus on maintaining yourself.

Judging by the responses here , the sociopaths are going to rule the world, sad. That is until they kill each other off, then the cockroaches will rule.

i believe you and i think it is a huge problem for evryone involved. she definitely needs professional help, this gets said alot, but in this case it is a necessity.
tell your parents she needs help, be upfront about it and put it back on them. say it as much as you can so noone is in any doubt about your views.
the next time there is drama in the house tell them again that she needs professional intervention and then your parents will start feeling guilty for not doing anything, tell visiting relatives too. all the best

Just like the user name above, this story was almost unreadable.

Is is too much to ask for paragraphs?! And if your sister wants to act strange and get herself into trouble, let her, it's obvious she has no control of herself.

This story seems made up to me. But if it's true, then could it be that it is you who understands those things this way in your mind? Perhaps you really do have some mental difficulty?

Sorry, it's just that your story has some problematic points so I can't take it truthful as whole. Maybe at best (just) part of it *is* true.

introduce me to your sister, she sounds wondeful and i'd like to meet the real her, not a fake profile

kick the shit out of her and stuff, she seems socially incompetent on some level but ya get her to a Psychiatrist ASAP

Multiple virtual identities dissociative disorder,
With pseudologia fantastica and schizotypal personality traits.Factitious somatoform disorder.
I just made it up.But kind of fits the picture.
In a society going mad only the maddest will survive.