You may have loved her when she was a baby…but that was before she could talk. As you got a bit older there’s no doubt that you wanted to sell her off for human sacrifice. By now, while she may still be a pain in your left armpit, (and she may still take three hours in the bathroom), you realize that having a sister while growing up may have possibly profited you in more ways than simply borrowing her money. For all you siblings out there – here are 10 of the most beneficial aspects (that you may not yet realize, but soon will learn) about having a sister.

1. She turned you into a strong, resilient human.

There’s nobody who can insult you quite like your sister. She knows your biggest insecurities, your worst fears, and will not hesitate to use them against you in an argument. After years of your violent and aggressive fights, the bullies in high school stood no chance against you.

2. You can always rely on her to tell you the ultimate truth.

While many of your friends will cushion their comments about sensitive topics, you know that your sister is the only one who will be honest enough to tell you that, “Yes, that dress makes you look pregnant.”

3. You now have two wardrobes.

As you were growing up you were always forced to wear the same thing except one of you had pink and one of you had blue. Now that you’re older, your sister actually has some different clothes to you (that you are obligated to steal whenever in crisis).

4. You are less likely to get divorced.

Studies have shown that each sibling you have decreases the likelihood of marital separation by 2 percent. Having a sister will teach you that it is possible to fight with and absolutely hate someone, but still love them at the same time.

5. You have a large and excessive amount of inside jokes that nobody else will ever understand.

She makes family get-togethers a lot more bearable, and you can communicate telepathically about something embarrassing that your mum just said with a simple look from across the table. In fact, your sister is the only one who shares your understanding about how truthfully, horrendously dysfunctional your family really is.

6. She has been your personal slave.

At some point in time, you can safely admit that your sister has fetched you water, tied your shoelaces, braided your hair, or done your homework. You have turned her into your real-life Barbie, experimenting and trying all of your new clothes, makeup and hairstyles on her to ensure that they look good before you wear them yourself.

7. She has brought out the roots of your competitiveness.

Let’s face it, there’s nothing worse than losing to your sister. You inherent competitive nature has sprung from having a sister who you’ve been compared to your whole life.

8. She has become an addition to your group of friends.

When your friends come over they like to aimlessly wander into your sister’s room. They consider your sister as an important aspect of your friendship, and are often honored to become a part of the sisterhood. You have also realized that your parents will automatically let you go anywhere with your friends as long as you take your sister along, so you’ve both been to the most extravagant, dishonorable places together in the name of family bonding.

9. You complete each other.

Unknowingly, you are two halves to a perfect whole. Your talents may differ but they tend to complement each other. On a regular afternoon, you may ask, “Hey sis, can you pluck my eyebrows?” to find her response being, “Only if you do my makeup for tonight.” We can’t be good at everything.

10. She is obligated to be your best friend.

You’ve known her your whole life and she’s been by your side since the younger one of you exited the womb. You have become a team against your parents, your exes and the world. She is the only one who knows exactly what you want for your birthday, and while you would tell all your friends that she was as annoying as a fly, if anyone messed with her you would have her back in a millisecond.