Sisters: your future bridesmaids, your go-to wing woman and the person who will be by your side no matter what. They're a blessing and curse, but if you are truly blessed, then you understand that there is no better friend out there then your sister. Here are thirteen reasons why your sister is actually your best friend.

1. She always tells you like it is. ALWAYS.

You know that cute boy that you went on a date with and haven't heard back from? You're probably telling yourself that he's been busy for the last week and a half when your sister says, "He's not interested in you because you wore that God-awful dress and snorted at all his jokes." The advice seems harsh now, but it will seem a lot harsher in six months.

2. There's the advantage of spending every year of your life together

THANK God there was someone there with you at that highly obnoxious family reunion back in 2005. She was right there by your side while the two of you avoided your weird cousins. Now it's one of your favorite memories.

3. Not to mention that you know what it's like to have insane parents.

Sometimes parents can embarrass your friends, but one of the perks of having your sister as your best friend is that the two of you have already seen all of your dad's weird dances and heard his insensitive jokes. You're pretty much immune to it now, and the worst part is you're both just like him now.

4. You go from yelling at each other to literally laughing about something you saw on twitter in just 0.2 seconds.

I cannot tell you how many times I got so mad at one of my sisters and SWORE I would never talk to them again. Then five minutes later she's showing me a new Biden and Obama meme and I don't even care anymore that she ran my car into the mailbox.

5. You have same opinions, taste, EVERYTHING

The two of you used to have distinct styles. You were each unique and had individuality, now your music playlists look exactly the same and you both have the same favorite character on Grey's Anatomy. You're basically one person now.

6. Your friends are her friends.

Her friends come over to see you, just as much as your friends come over to see her. Your separate pools of friends have now merged, which means you can use the same guest list for every event that you host.

7. And her enemies are your enemies.

That boy that broke up with her via text is now blocked from every one of your social media accounts and your so called friend that has been talking trash about you is now enemy number one for your sis. I'm pretty sure this is, like, a known code of sisterhood.

8. You've also tried to kill each other at least once.

Every sister has tried to kill each other, and this is the main difference between any other friend and a sister. If you throw a butter knife at a friend you'll end up in jail, but if you throw one at your sister then you'll just throw a chair at her and call it a day.

9. You always stalk each other's guy to make sure he's worthy of dating your sister

Is he an axe murderer? A cheater? A momma's boy? Give your phone to your sister and you'll have all the info you need in ten minutes or less. Regardless if you have her permission or not.

10. But having a boyfriend is SO hard because he has to get along with her too.

Forget about you being the third wheel. Your poor sister's boyfriend will be the third wheel if you don't find the right guy. Get you a Scott to your Kourtney and Khloe.

11. She will always be your plus one.

Prom? Formal? Awkward Office party? Your sis is the perfect date because she will A) not be awkward and act like a weirdo and B) not expect anything after the night is over. You can go home afterwards and laugh about how much you embarrassed each other .

12. And her closet is your favorite place to shop.

If anyone asks you where you got your top and nine out of ten times you're likely to say, "From my sister's closet," then you understand there are officially no more boundaries. You might as well share the same bed and get one of those joint Facebook accounts that married people have.

13. Best friends? More like soul mates.

It's pretty much until death due you part.