How to babysit a little sister?

Stop! Breath! then think like a kid. She is acting out for any kind of attention. you need to change your attitude. act like her buddy her best friend be kind like you love her so much. dont be negative in anyway dont say I told you, say can you? or will you.and praise her. have her play a game with you it has to be one she is interested in color or paint or what ever she is interested in keep her occupied with you. and if you keep this up. she will behave . tell her how great she is and you care for her I promise you will see a different child. remember its you and her against the world. if she believes this she will look up to you respect you and stop this crazy behavior. your older and she looks up to you.