John Grainger

John Grainger was the son of Edward Grainger. (ST: Incongruous Details)

Biography
In 1956, at the age of 5, John was haunted by a manifestation of his father's "dark side", the Doctor managed to save John by trapping the spirit back inside Edward Grainger. (ST: Dear John)

At one point in his life, John fathered Linda Grainger. (ST: Forgotten)