Bruce Cameron's book 8 Simple Rules for Dating My Teenage Daughter.
The rules are: The third season took a creative turn, revolving more around cousin C. and Jim, the grandfather, than the immediate Hennessy family, more specifically not revolving around the raising of the Hennessy girls.
James Garner and David Spade later joined the main cast as Cate's father and nephew, Jim Egan and C. Barnes, in an attempt to fill the void left by Ritter.
The father, Paul Hennessy (John Ritter), was a sportswriter who is prompted by his wife Cate's (Katey Sagal) return to nursing to take a more active role in raising their two teenage daughters, Bridget (Kaley Cuoco), and Kerry (Amy Davidson), and son Rory (Martin Spanjers).
The series's name and premise were derived from the book 8 Simple Rules for Dating My Teenage Daughter by W. While 8 Simple Rules was renewed for a second season and production had begun, Ritter's sudden death in September 2003 left the series in an uncertain position.
After a hiatus, the series returned and continued without Ritter, with the producers deciding to kill off Paul and not replace him.
He is soon overwhelmed by the responsibility of being the father of teenage daughters and misses being a sports writer.
Paul begins writing a column from home about his struggles with his children and offers advice to people who are in his same position.