John Watt was born 17 August 1920 in Montreal, Quebec, Canada to Henry Watt (1888-1972) and Margaret Elizabeth Cheng (1896-1967) and died 9 July 1998 Montreal, Quebec, Canada of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| Kathryn Ann Watt (1945-2008) | 1 March 1945 Montreal, Quebec, Canada | 26 March 2008 Montreal, Quebec, Canada | Charles Kastner (1924-2019) |
Siblings