Grace (That ’70s Show) will play middle sibling Tom, an intellectual/novelist who has had a couple of books that sold decently, though his last one did not. Caitlin McGee (Bluff City Law) portrays the eldest sibling, Sarah, a therapist for at-risk kids who is married to a teacher, and as such they’re often scraping to make ends meet. A doting mom to her two kids, she tries to be a guru to her two brothers, who obviously would be lost without her wisdom.