If you've been blessed to have a sister, you know that the love and laughter doesn't exist without the fights and stolen clothes. It's the price you pay to have someone who laughs with you, laughs at you, keeps secrets from mom and dad, and makes you happier than anyone ever could. Tina Fey and Amy Poehler hit the nail on the head in their movie, "Sisters," showing everyone the truth behind this irreplaceable relationship.

1. She's always happy to see you.

2. When you lost something, she knows exactly where to find it...in her closet.

3. She was your first girl fight.

4. But she always has your back.

6. You still remember the embarrassing dances you created as kids.

7. Dieting together is usually a fail.

8. She can convince you to break any rule.

9. And when you both break the rules, you are responsible about it.

10. Or at least try to be responsible about it.

11. Fighting always ends with something being destroyed.

12. You're always on the same page.

13. Shopping trips usually turn into adventures.

14. She pushes you out of your comfort zone.

15. You can say anything to each other with no judgement.

17. You're forever each other's best friend...because you have no other choice.