How should I deal with my bratty little sister?

She is only three and she is already getting my other sister and I into trouble. (See my 360 page for a picture of the little monster). She is so mean and when I try to talk to my parents about it, all they say it "Stop making up pathetic lies to get your little sister into trouble. She would NEVER do something like that to you!" Guess what? she does! I absoultey hate her! What should I do?