"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSZN-WW5 : 11 March 2018), Mary Dineen in entry for Thomas Sweeney and Mary Elizabeth Sullivan, 10 Nov 1908; citing registration , Peterborough, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,871,868.
"Canada Census, 1851," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWTD-49V : 3 August 2016), Mary Dinneen, Whitby, Ontario County, Canada West (Ontario), Canada; citing p. 37, line 24; Library and Archives Canada film number C_11742, Public Archives, Ontario.
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her ancestors' 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 Mary: