Bella Has a Lil' Sis - Emmett Cullen

Turns out Bella has a Little Sis. Did the cullens know about her you ask. Barely. Bella has mentioned her a few times to them but their like small thing like,
"i really wish darce was here right now"
"I should go call darcy and mom to see how they're doing"
But she never told them who she was all they new was her name but they didn't know the relation between her and Bella. they didn't even know if Darcy was a male or female. But thats all about to change when she moves to Forks with her father and sister.