"Texas Births and Christenings, 1840-1981", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F6P7-8JM : 13 December 2019), Clarence C Douglas in entry for Mary Ellen Douglas, 1916.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHTH-H32 : accessed 17 January 2020), Mary E Douglas in household of Clarance C Douglas, Waxahachie Ward 3, Ellis, Texas, United States; citing ED 122, sheet 14A...
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:H51J-T2M : accessed 17 January 2020), Mary E Douglas in household of Clarance Douglas, Waxahachie, Ellis, Texas, United States; citing enumeration district (ED) ED 4, sheet 11A, line 33, family 288, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2326; FHL microfilm 2,342,060.
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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: