Yeah, that's so stupid! My sister also b*tches to my mom when she doesn't get her way or when she's caught lying. She always tells my mom that I'm "being mean"... And of course, she tells my mom some half-assed story of what happened.

Like your sister, she does the same thing... She openly tells me she doesn't like something, but later on when something happens, she suddenly "cares". Then when I tell her, "I thought you didn't care?", she goes b*tching to my mom that I'm "being mean again". I know THAT all too well

Sounds like your sister is being such a b*tch to you. It seems like she's so desperate to be your twin and she gets upset that you don't want her to be. (Again, I can't blame you for wanting your own identity.)

Have you talked to your mom about her -- like the fact you want your own identity and she won't let you have it? It sounds like your sister is feeding her a lot of b*llshit and that your mom is getting a very one-sided story. I suppose there's nothing you can do to stop your sister from copying you, but maybe your mom can help settle the problem?