1. The non-stop fighting.

As a sister myself, this is something I know real well. From the time you and your sister were toddlers, you've always fought. You fought in the car, you fought over your toys, you fought over who gets to pick out the new puppy. And now whether its fighting over who gets to sit shotgun, fighting over whether to watch The Office or to watch Gilmore Girls, or fighting over stupid little petty things, the fighting is non-stop and has been driving your parents crazy for years. Although after all these years you'd think they would be used to it by now.

2. Borrowing each other's clothes.

One of the perks of having a sister is when you go to the store and there's something you both like but the other sister gets it, you think to yourself, "Okay, that's fine. I'll just borrow it when she's not looking". It's all fun and games until she catches you wearing it.

3. Driving each other crazy.

One of the downsides of having a sister is the pure fact that you were born to drive each other crazy. Trust me, I know. It's so much fun driving your sister crazy by blaring the music you know she doesn't like through the house... until she does the same thing to you. But it's all in the fun of having a sister, because life would be so boring without someone to bug. It's altogether a constant banter that will never end.

4. You have someone who puts up with your sass and craziness.

We all have a crazy side that comes out when you're with your closest friends. Well, believe it or not, there's an even crazier side that comes out when you're with your sister! I know, hard to believe, right? When you're with your sister you can be as crazy and as loud as you want because she's just as crazy. You can also be as sassy as you want with each other because you know very well that you'll be sisters for a very long time and you have to love each other no matter what.

5. Whether you want to admit or not, you miss them every once in a while.

Let's face it, it's nice when you have a break from your sister for a little bit but, after a while you have no one to rush to when you have some new gossip to tell or no one to sit there and laugh like idiots together while you watch trampoline fails on YouTube or at terrible memes on Instagram.