"New York State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNV1-5SC : 11 March 2018), Mary Keenan in household of Thomas Mcdonough, Buffalo, Erie, New York, United States; citing p. 47, line 13, State Library, Albany; FHL microfilm 825,689.
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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: