According to Mary Jane Hartwick's death certificate, her mother's name was Sarah Jackson.[1]
Sources
↑ "Canada, Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JKWG-CL7 : 2 March 2021), Sarah Jackson in entry for Mary Jane Patton, 19 Sep 1928; citing Brant, Ontario, Canada, 9255, Registrar General. Archives of Ontario, Toronto; FHL microfilm 2,148,995..
"Canada, Ontario Census, 1861," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQQ2-16S : 9 March 2018), Sarah Hartwick, London, Middlesex, Ontario, Canada; citing p. 90, line 15; Library and Archives Canada film number C-1050-1051, Public Archives, Toronto; FHL microfilm 349,296.
"Canada Census Mortality Schedules, 1871," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XM3Q-8ZM : 11 March 2018), Sarah Hartwick, 02, London c, East Middlesex 09, Ontario, Canada; citing p. 1, line 7, 02, London c, East Middlesex 09, Ontario, Canada, Public Archives, Ottawa, Ontario; FHL microfilm 4,396,743.
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DNA Connections
It may be possible to confirm family relationships with Sarah by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Sarah: