User blog comment:MichaelDiaz101/My Daily Life: Part 2/@comment-4833053-20120815211944/@comment-4675595-20120816010422

Quick question: Why bring up that you live in Florida, near shark attacks? Is your sister going to feed you to sharks, or....?

Pretty much seconding Memai's points, though. I was the youngest and smallest in my family, so I know that getting into fights won't solve anything. The best way to deal with it is to act like it doesn't get to you - or, if she does something that's seriously not okay, try to reason with her, without attacking. If she doesn't want to hear it, ignore her.