1. You gain another teammate to tease your brother.

2. She gets all the things that irritate you about your brother.

3. She understands all the great qualities about your brother that most people don't usually see.

4. You get one more person to tease.

5. She helps with holidays and parties.

6. You can always count on her to show up to concerts, parties, school events, and otherwise, because...

7. They're trying to get brownie points, and you can take advantage of that.

8. Your brother will finally start supporting you in these events too, because their girlfriend makes them.

9. You don't have to exhibit any sort of affection for your brother anymore (at least, very rarely).

10. But in a lot of ways, it's easier to get along with your brother since he has gotten into the habit of being nice to someone for once.

11. You can go to each other for relationship advice.

12. You can be honest with each other, especially as she gets to know your family better.

13. She will come to you every once in awhile when she's frustrated with your brother, and you don't question her frustration once. You've been there.

14. You have a go-to person for girls' days.

15. She gets along with your brothers' friends and people in your extended family that you don't normally talk to.

16. If you're in a relationship, you have a go-to couple for double dates.

17. The best part about these doubles dates is that because it's your brother, you're basically guaranteed to find some activity that you'll all like.

18. The fact that someone could love your brother as much as she does gives you a better appreciation for your brother.

19. Together, they make the best road-trip buddies, because she'll call your brother out on his bad driving, awful music taste, and when he is being inconsiderate of your need for a bathroom.

20. You get a sister, even if it's not for forever, this time with them is precious.