"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLHQ-QCC : accessed 12 June 2018), Mary L Chapman in household of John R Chapman, Lowell, Sioux, Nebraska, United States; citing enumeration district (ED) ED 228, sheet 3B, family 81, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 855; FHL microfilm 1,374,868.
United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNK1-WLH : accessed 12 June 2018), Mary Chapman in household of J R Chapman, Banks, Upshur, West Virginia, United States; citing ED 131, sheet 8A, line 3, family 132, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1968; FHL microfilm 1,821,968.
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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: