"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6RV-4WS : 15 July 2017), Mary A Matheny in entry for David Young, 1880; citing enumeration district ED 6, sheet 393D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 1400; FHL microfilm 1,255,400.
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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: