The larger things that this book -- and all my books -- revolve around are a woman's id, ... And how she defines herself in the world around her. ... I've always been interested in issues of what has been defined as maternity and how it's changed. ... For both Kate and Kitty, they're twins in a way; I didn't want to whack the reader over the head with it, but with Kate, her mother was the sun that everything revolves around, and for Kitty, it was about a mother that wasn't there. Jennifer Weiner