Death record of son, Thomas Leach. "Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JNDL-JQ8 : 26 March 2020), John Leach in entry for Thomas Leach, 23 Dec 1932; citing Chapple Twp, Rainy River, Ontario, Canada, 29277, Registrar General. Archives of Ontario, Toronto; FHL microfilm 2,378,661.
Find a Grave, database and images (https://www.findagrave.com/memorial/225870275/john-spencer-leach: accessed 21 February 2023), memorial page for John Spencer Leach (1822–26 Aug 1916), Find a Grave Memorial ID 225870275, citing Saint Bede's Anglican Cemetery, Smiths Falls, Lanark County, Ontario, Canada; Maintained by JulieG (contributor 50331288).
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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 Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: