"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M948-5DK : accessed 31 May 2019), Benjimin F Horn in household of Sarah E Horn, Magisterial District 5 Vine Grove town, Hardin, Kentucky, United States; citing enumeration district (ED) 48, sheet 12A, family 251, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,525.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKDQ-PQS : accessed 31 May 2019), Henry C Horn, Rozetta, Henderson, Illinois, United States; citing enumeration district (ED) ED 38, sheet 2B, family 37, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 289; FHL microfilm 1,374,302.
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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: