How to get bakc at my sister?

[savannah]

She has multiple things like went on my facebook talked to people i hate with a strong passion, snitched on me and told my mom i snuck out in the middle of the night with friends, and now she stole my money. She is twelve and im 13 almost 14 so she does know better. I havent did anything about it. Give me some ideas? Good ones to get her back good! And so that i dont get caught.

[elray]

condom's in her room /purse where mom would find them is one of my favorites.

[shorticicle752]

Don't get back at her, get points that you can use to undermine her. She is no angel and you can find something she did that she wasn't supposed to, and blackmail her with this information.
In the end both of you will learn to coexist or you will be in the constant struggle. You need to learn what makes her tick. Two girls in the family will always be fighting for dominance. Keep her in place but don't destroy her, for later she might be the only friend you will have in the world.