Rebekah Falkner

is the older daughter of Ben and Esther Falkner, and the big sister of Deborah Falkner. 

She "hit it off famously" with Chaz Villette when Chaz stayed with the Falkners for a couple of weeks upon first moving to DC. She has Chaz's email address and asks him for waffle recipes. However, Rebekah does not appear to have a crush on Chaz, to her mother's relief. 

She was nicknamed "Penguin" as a baby. 

In the DVD extra "Big Brothers", she asks Chaz how to tell if a boy likes her.