John Grainger (born 1951) was the son of Edward Grainger. (PROSE: First Born, Dear John, Testament)
In 1956, at the age of five, John was haunted by a manifestation of his father's "dark side". The Eighth Doctor saved John by trapping the spirit back inside his father. (PROSE: Dear John)
John was the father of Linda Grainger. (PROSE: Forgotten)