"Canada Census, 1891," , FamilySearch (https://familysearch.org/ark:/61903/1:1:MWL5-KV6 : 3 August 2016), John Geo Oleary, Mara, Ontario North, Ontario, Canada; Public Archives, Ottawa, Ontario; Library and Archives Canada film number 30953_148159.
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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.
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: