Sadly no one in fanfics will ever experience the... "Excitement" and "joy" of having siblings in your lives...

-brothers-

Me:"GIVE ME THE REMOTE YOU PIECE OF SHIT!!!"

Brother: NO, IT'S MY TURN TO WATCH MY SHOW!!!

Me: -is wrestling with brother.- MOM, DREW'S BEING A BITCH!!!

-sisters-

Me: You took my toys!

Sister: did not! Mom!!!

-Being the middle child-

Older sibling: -is ranting to you about younger sibling.-

Younger sibling: Is ranting to you about older sibling.

You're basically an argument solver. Not to mention, your basically stuck between two "super stars".

~~Benefits~~

-Brothers-
You are a wrestling champion!!! Don't let anyone take that away from you...
You also don't usually conform to the typical "girl" (if you're a girl that is, you will most likely have a better respect for primarily stereotypical male fields (I fuckin love science mmk??)) you get a unique perspective on things. (Plz don't take this the wrong way...)
Plus, if some guy or girl hurts you, fuck. They'd better watch out...

-Sisters-
You are a great listener, not to mention you can braid hair like a boss.
And if you're a strait boy, or a gay girl, dealing with female drama from your significant other will be more easy. (I don't have any sisters...))

-both-
You have a lot of people to comfort you...
And you can have a pretty level head.

-all older siblings-
You get to be the brat child. >:3

-all younger siblings.-
CU-CHING! IS THAT SOME PRIME BABY SITTING CASH I HEAR??!!!
Not to mention, more then likely, you're the perfect child.

This is all horoscope bs mostly. Plz don't take offense to this.