If you give a girl a sister, she will probably be confused at first. Odds are she’s young and she’s used to having all of mom and dad’s attention. She may smile at her, or ask to give her a kiss, she may hold her hand, or in some cases, sniff her and walk away. If you give a girl a sister, she will probably forget about her baby dolls.

If you give a girl a sister, she will probably lose a few nights of sleep. The preschool homework of playing in the dirt has been wearing down on her, and she’ll get frustrated by a crying baby keeping her up all the time.

If you give a girl a sister, and you deprive her of her sleep, she will probably realize all of the other things she has to give up now that there are two of you. She may share her toys for a little bit, but odds are she will take them back when you overstay your welcome. A sister always has to assert her dominance of the playroom.

If you give a girl a sister, she will probably come at you with safety scissors at one point or another, just to show mom and dad she’s been practicing for beauty school.

If you give a girl a sister, she will probably ignore you in the hallway if she’s with her friends. She is at the age where boys matter, and she can’t have an annoying elementary schooler wearing down her popularity. If you give a girl a sister, she will probably not let you sit with her on the bus, but be the first person to step in if anyone gives you trouble. No matter how bad your antics are, it’s the sister code to have each other's backs.

If you give a girl a sister, you will share things that will strengthen your relationship and bond that wouldn’t be the same if you gave a girl a brother. You will share secrets and gossip and fights and makeup (once she teaches you how to wear it, of course) and maybe even clothes. Odds are you will be the same size. Once in a while, your favorite tops will go missing. Just know they are in your sister’s top drawer. Get ready for the countless fights that will be broken up by mom before school over stolen cardigans.

If you give a girl a sister, you will probably have to share a car. You will also have to share a lot more, and odds are she will rarely ask before borrowing your stuff. Be patient.

If you give a girl a sister, she will be waiting at the front door on Friday night, waiting to find out if you had your first kiss. She will want to help pick out every dress for every dance and prom so she can wear it when it’s her turn. She will probably try to embarrass you in front of your first boyfriend or catch you kissing in the hallway at school so she can tell mom. She is only doing it because she wants to be a part of your life.

If you give a girl a sister, you will fight over everything. There will be screaming, yelling, tears, and disagreements at just about every hour of the day. Mothers with daughters are usually the first to get gray hair.

But if you give a girl a sister, no matter how different from you, she will be your best friend. When you give a girl a sister, you give her a live-in friend that knows you better than you know yourself. She knows what you wear, how you think, how you react, how you manage your time, what sets you off, and what gives you an attitude. She will find your buttons, and she will push them…hard. She will know to stay out of it when you are having a fight with mom and dad, but be the first to tell on you when you’re being mean to her. But she will be your best friend. No one else will ever have your back or keep your secrets like a sister because there’s no one else more like you.

Finally, if you give a girl a sister, you are giving her the whole world in a package that looks like you. When you give a girl a sister, you are giving her the greatest treasure in the packaging of french braids and blue nail polish.

When you give a girl a sister, you are giving her the greatest soulmate and adventure.