<Tr> <Th> Children </Th> <Td> Dean Winchester (son) Sam Winchester (son) Adam Milligan (son) </Td> </Tr> <Tr> <Th> Nationality </Th> <Td> United States </Td> </Tr> <P> John Eric Winchester is a fictional character on The CW's series Supernatural, and the protagonist of the comic book spin - off series Supernatural: Origins . Developed by series creator Eric Kripke, the character is mainly portrayed by Jeffrey Dean Morgan . John is the father of Sam and Dean Winchester, the show's protagonists . </P> <P> Seeking revenge after his wife Mary was killed by the demon Azazel, John Winchester became a hunter and raised his two sons to fight the supernatural . John disappears early in Supernatural, and the first season revolves primarily around Sam and Dean trying to find him . Morgan was also filming episodes of Grey's Anatomy while the first season of Supernatural was under production, and future appearances of the character were hindered by his busy schedule . While Morgan's portrayal has been praised, fans and critics were generally frustrated at the character for keeping so many secrets . </P>

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