I didn't really get the question, but having Serena as sister would be awesome!

Why are chuck and Nate options??!
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Anywayblair would be an awesome sister and I'd love to steal all her clothes =]
serena would be great too =D

Is it asking whe we's rather see have a sister, or who we's rather have as OUR sister> I'm confused, but either way I choose Blair or Serena :D

or Blair

anyone started you she would kick there ass

sister = blair
brother = chuck

xD

or Serena xD I think they're really good sisters.
I would want Blair to be my friend, not my family.
and Chuck is just too perfect to be a brother ;)

Or maybe Blair! If Jenny was my sis I would be a beater

Blair is too judgmental and competitive, she'd try to outdo me and outshine me in everything. Serena is supportive and she's a great sibling to Eric, a great listener, and a great friend to Blair. <3 I'd love to have her as either my sister or my BFF!

SHE'S UNDERSTANDING.

Blair. Shes loyal and very maternal. She's actually a really good listener as well. She's a great role model in the school and no hardcore partying sense. She likes alot of the same things I like and it wouldnt be a competition because Id be struggling to be like my big sister. Plus Ive always strived for perfection and expect others to do the same. I'd always feel protected and like someone has my back.