1. How to sing into your hairbrush like a pop diva.
2. And if you put your talents together you become actual superstars.
3. Big sisters teach you how to break the rules.
4. How to be competitive without being a total bitch.
5. You also learn that copying each other is how sisters express their respect.
6. Your sister was the first to wear heels.
7. And the first to hit puberty.
8. Big sisters teach you how to deal with your parent's awkward questions.
9. And how to shut them down.
10. She teaches you that privacy doesn't really exist.
