Son of Major (retired) Arthur Samuel, DSO, 47th Battalion, Canadian Infantry and Dorothy L. Mills, of Kenilworth, Cape Town, South Africa. Born Vancouver, British Columbia, Canada. Lieutenant Mills' older brothers Donald and Ian were born in England during the First World War. Upon demobilization from service in the First World War, Major Mills and his family returned to Canada, where Lieutenant Mills and his sister Majorie Joan were born. Major Mills was employed with Sun Life Assurance Company of Canada. In 1931, he was appointed manager of the Company in their Cape Town Office, South Africa. The family relocated to Kenliworth, Cape Town, South Africa, where Lieutenant Mills joined the South Africa Air Force. Today his brother Ian Mills resides in Heriot Bay, British Columbia and his brother Donald and sister Marjorie Joan still reside in Cape Town, South Africa.