"Canada Census, 1871," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4QH-RB4 : 11 March 2018), John Silverthon, Sydenham, North Grey, Ontario, Canada; citing p. 13, line 11; Library and Archives Canada film number C-9954, Public Archives, Ottawa, Ontario; FHL microfilm 4,396,339.
"Canada Census, 1881," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVF5-RBZ : accessed 12 December 2015), John Silverthorn in household of Joseph Silverthorn, Owen Sound, Grey North, Ontario, Canada; citing p. 35; Library and Archives Canada film number C-13261, Library and Archives Canada, Ottawa, Ontario; FHL microfilm 1,375,897.
"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZB6-P1C : accessed 11 December 2015), John Martin Silverthorn and Ann Jane Christie, 19 Dec 1900; citing registration , Owen Sound, Grey, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,871,080.
"Canada Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KH2T-83R : accessed 11 December 2015), John M Silverthorn, D, Grey (north/nord), Ontario, Canada; citing p. 22, Library and Archives of Canada, Ottawa.
"Recensement du Canada de 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV9T-H2Y8 : accessed 11 December 2015), John M Silverthorn, 1911; citing Census, Grey North Sub-Districts 47-57, Ontario, Canada, Library and Archives of Canada, Ottawa, Ontario; FHL microfilm 2,417,699.
"Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JKWF-WF7 : accessed 11 December 2015), John Martin Silverthorn, 07 Jan 1927; citing Essex, Ontario, Canada, 12797, Archives of Ontario, Toronto; FHL microfilm 2,130,916.
"History of the Silverthorn Family", compiled and edited by Frank Freemont Reed. Published 1982 by Silverthorn(e) Family Association. John is mentioned on p.1940.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: