Sarah's sister??

I think that she have know sister and she made it up because the flash backs whit her father I never saw another kid and her father didn't mention one eather (sorry for my english it's really bad)

Maybe her sister is somewhere out there or she was just saying that to Ellie,Awesome and Morgan for her cover

i bet she has a sister who prob stayed with her mother when her parents split the sunburn lie was a little too well done for it not to be true no? ha more than likely she'll be a spy cos everyone else's family members turn out to be spies and graham (cia black guy that gave sarah the chance to be a spy) would have known she had a sister if it turns out that she does have one at all. Hope she does thou cos we need more sarah back story..so long as nbc dont cancel it :'-(