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8 Simple Rules is an American television sitcom that ran on ABC from September 17, 2002, to April 22, 2005. The show starred John Ritter as Paul Hennessy, a widower raising his three children with his sister-in-law Cate Hennessy (Katey Sagal). The show was created by Bob Saget and was based on the book of the same name by Bonnie Hunt.