"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN5R-ST4 : accessed 26 November 2017), Mary P Colley in household of Newell G Colley, Martin, Weakley, Tennessee, United States; citing ED 134, sheet 11A, line 32, family 258, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1771; FHL microfilm 1,821,771.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPW2-KH5 : accessed 26 November 2017), Mary Pauline Calley in household of Newell G Calley, District 12, Davidson, Tennessee, United States; citing enumeration district (ED) ED 236, sheet 34A, line 47, family 788, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2244; FHL microfilm 2,341,978.
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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: