Mary was born in 1850. She was the daughter of James Sumner and Olive Cox. She passed away in 1925.
Sources
Find a Grave, database and images (https://www.findagrave.com : accessed 29 October 2020), memorial page for Mary Sumner Davis (4 Oct 1850–12 Jan 1925), Find a Grave Memorial no. 17345885, citing Concord Cemetery, Williamsburg, Whitley County, Kentucky, USA ; Maintained by Find a Grave (contributor 8) .
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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: