8 Simple Rules (formerly titled 8 Simple Rules for Dating My Teenage Daughter) is based on the best-selling book series of the same name. The series follows the lives of the Hennessy family, who in the second and third seasons, dealt with the loss of their father and family patriarch, Paul, and the next chapter in their lives. His wife, Cate, now a single mother, is still with a full time job at the hospital and still tries to raise her three kids: Bridget, Kerry, and Rory. Luckily for Cate, her father Jim and her crazy nephew C.J. have decided to stay at her home and help her raise her children. Most noticeably starring : John Ritter as Paul, Kalye Cuoco (pre "The Big Bang Theory") as Bridget, Katey Sagal (Married with Children) as Cate, and David Spade as C.J. (pre "Rules of Engagment") .