John had eight other brothers and sisters. In addition to silent screen
star
Robert Harron, they included Charles, Theresa (Tessie), Madeline, Agnes
(who became a nun), Mary, Edna, and a daughter who died in childhood. A
few of John's other brothers and sisters also appeared in Bobby's films
as extras. Of all nine children, John was the only one to marry to
continue a new generation. He and wife Betty had one child, Colleene
(Harron) Kiley, who ended up having nine children of her own.