Scott was born on August 1, 1899, in Quebec City, the sixth of seven children. His father was Frederick George Scott, "an Anglican priest, minor poet and staunch advocate of the civilizing tradition of imperial Britain, who instilled in his son a commitment to serve mankind, a love for the regenerative balance of the Laurentian landscape and a firm respect for the social order." He witnessed the riots in the city during the Conscription Crisis of 1917.