"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SP4L-Y96 : accessed 23 September 2017), Mary E Henderson in household of A Edward Henderson, Knoxville, Knox, Tennessee, United States; citing enumeration district (ED) ED 49, sheet 6A, line 32, family 110, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2259; FHL microfilm 2,341,993.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4C9-JBV : accessed 23 September 2017), Mary Henderson in household of Ed Henderson, Ward 20, Knoxville, Civil District 8, Knox, Tennessee, United States; citing enumeration district (ED) 97-101, sheet 3A, line 13, family 44, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3958.
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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: