 Sproule was related to William Kingston Flesher (June 10, 1825 – July 22, 1907), a settler of southwestern Ontario, a militia officer, businessman and political figure.As well as founding the village of Flesherton, he represented the riding of Grey East in the House of Commons of Canada as a Conservative member from 1872 to 1878.Flesher's son-in-law was Thomas Simpson Sproule, Speaker of the House of Commons of Canada and Canadian Senator.