Source: Via Mark Carmichael Excel spreadsheet dated September 2025 re. soldiers of the 116th Battalion that served with the 18th.
Family Search: When Private Robert James Cook was born on 22 February 1897, in West Gwillimbury Township, Simcoe, Ontario, Canada, his father, John Cook, was 29 and his mother, Annie Isabel Ney, was 26. He had at least 1 daughter with Agnes. He lived in Summerville, Mississauga, Peel, Ontario, Canada in 1923. He registered for military service in 1915. In 1915, at the age of 18, his occupation is listed as farmer in Snelgrove, Brampton, Peel, Ontario, Canada. He died on 26 January 1970, in Toronto, Ontario, Canada, at the age of 72, and was buried in Pine Hills Cemetery, Scarborough, Toronto, Ontario, Canada.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 