The woman you see here is the same woman as in the previous comic--she's just wearing a different dress and has her hair styled differently. One thing I'm trying to do with this comic, which I never tried with any previous comics, is draw the characters a little differently each time. Different clothes, hair, make-up, whatever.
I'm not totally happy with the way she looks, here. It looked a lot better in my sketch book. Nathan on the couch, however, is my favorite rendering of him yet, even though it has been pointed out to me that it looks like something is coming out of his mouth. That's the back arch of the sofa, folks.
Anyway, Nathan's sister's name is Deborah. I'm giving it to you now, because who knows when it'll actually come up in the comic?