Source: 116th Excel sheet by Mark Carmichael re. soldiers of 116th that served with the 18th Battalion.
His brother, Sergeant Robert Henry Coyston, 408716, did not survive the war.
Family Search: When George Henry Coyston was born on 16 June 1892, in Mile End, London, England, United Kingdom, his father, Arthur Coyston, was 32 and his mother, Hannah Clara Wales, was 29. He married Florence Bridget Gange on 8 May 1916, in Oshawa, Ontario, Canada West, British Colonial America. They were the parents of at least 2 sons and 3 daughters. He lived in Oshawa, Durham, Ontario, Canada in 1915 and St. Vital, Winnipeg, Manitoba, Canada in 1922. He registered for military service in 1915. In 1915, at the age of 23, his occupation is listed as shipper. He died on 29 April 1965, in Winnipeg, Manitoba, Canada, at the age of 72, and was buried in Saint Marys Cemetery, Winnipeg, Winnipeg, Manitoba, Canada.
War Diary of the 18th Battalion CEF 