Source: Per David Archer post at 18th Battalion Facebook Group.
Family Search: When Private Joseph Wynn Mitchell was born on 25 November 1891, in Denbighshire, Wales, United Kingdom, his father, Joseph Mitchell, was 26 and his mother, Mary Wynn, was 26. He married Nellie Evelyn Parbery on 5 August 1915, in Brampton, Peel, Ontario, Canada. He immigrated to Canada in 1913 and lived in St Helens, Lancashire, England, United Kingdom in 1901. He registered for military service in 1916. In 1916, at the age of 25, his occupation is listed as pressman in Brampton, Peel, Ontario, Canada. He died on 14 July 1965, in Brampton, Peel, Ontario, Canada, at the age of 73.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 