During the teenage years, finding good friendships can be difficult. There’s often drama and fair-weather friends. But you may just find that your BFF is actually “the girl next door.”

1. You have a built-in best friend for life. You two are together through thick and thin, literally.

2. With a sister, every night is a slumber party. You can stay up ridiculously late talking and laughing your heads off. Everything just seems funnier with your sister.

3. If you two get into an argument, you know that your “sisterhood” isn’t over. Unlike friendships, this relationship can’t abruptly end over an argument. You both have to work it out together and makeup. (Even if it requires sliding multiple hand-written notes under her door and then texting her a funny meme, hoping that she forgives you).

4. When you’re alone in public and want to avoid talking to people (or looking like a loner), call your sister. If she doesn’t answer, hold your phone to your ear and pretend to be talking to her. Then call her ten more times to be annoying because she didn’t answer when you desperately needed her to.

5. If you’re both in an argument with your parents, you have someone who’ll always be on your side. Well, for the most part. Unless siding with your parents will strongly benefit you, then side with your parents. She’ll get over it and then do the same thing to you.

6. She will pick out your outfits every morning because you’re so indecisive. She’ll also pick where to go for dinner and what to do on Saturday. Again, because you’re so indecisive.

7. Her closet is your closet. Her makeup is your makeup. Of course, it goes both ways, it’s a win-win.

8. You two have the best inside jokes ever. You can’t play Charades or Pictionary with anyone else because they’ll all think you’re cheating.

9. You can talk to each other without using words. Just by looking at each other you can tell what the other is thinking. Kinda creepy.

10. You don’t have to hide any emotions or quirky personality traits from her. She knows every part of who you are, and that’s what makes your sisterhood so much better.

11. You get introduced to new music and instantly fall in love with her Spotify playlist, although she would rather poke her ears out than hear your musical show tunes when you’re getting ready in the morning.

12. She’ll “like” every Instagram picture you post. It comes with the job description.

13. You can learn from her mistakes… and later use them against her while attempting to be your parents’ favorite child (hypothetically speaking, of course).

14. You always have someone to turn to for advice, and you know without a doubt that you’re getting the whole truth.

15. She will never judge you. Even if you’re stuffing your face with Nestle Toll House cookie dough. Instead of telling you how unhealthy it is, she’ll grab a spoon and join in.

When one of you moves out of the house to go to school or work, you realize that you didn’t tell her nearly enough how grateful you are for the relationship you have. Because now you don’t always have your go-to gal in the room next door, nor do you get to have a sleepover every night.

Cherish every minute you have with your sister because no one can replace the bond that you two have.