Source: Per Allan Mill of the 149th (Lambtons) Facebook Group query re. Military Medal.
Family Search: When Private Wesley Clinton Gray MM was born on 19 April 1897, in Petrolia, Lambton, Ontario, Canada, his father, James Robert Gray, was 29 and his mother, Mildred Ada Williams, was 25. He married Erma Walker on 29 September 1921, in Petrolia, Lambton, Ontario, Canada. They were the parents of at least 1 son and 1 daughter. He registered for military service in 1915. In 1915, at the age of 18, his occupation is listed as farmer. He died on 8 September 1955, in Alameda, California, United States, at the age of 58, and was buried in Chapel of the Chimes Columbarium and Mausoleum, Oakland, Alameda, California, United States.
Military Medal per soldier’s service record.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 