"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M6FQ-YHX : accessed 4 January 2015), Mary L Jacks in household of John M Jacks, May, Platte, Missouri, United States, 99; citing sheet 182A, film number 0710, NARA microfilm publication T9, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,254,710.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M38H-MFD : accessed 4 January 2015), Lattie Jacks in household of John M Jacks, May Township, Platte, Missouri, United States; citing sheet 6A, family 112, NARA microfilm publication T623, National Archives and Records Administration, Washington, D.C.; FHL microfilm 1,240,882.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M2BG-9SJ : accessed 4 January 2015), Lattie Jacks in household of John M Jacks, May, Platte, Missouri, United States; citing enumeration district (ED) 156, sheet 6A, family 125, NARA microfilm publication T624, National Archives and Records Administration, Washington, D.C.; FHL microfilm 1,374,818.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8C5-X65 : accessed 4 January 2015), Mary C Jacks in household of John M Jacks, May, Platte, Missouri, United States; citing sheet 7A, family 166, NARA microfilm publication T625, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,820,942.
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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: