"Maryland Births and Christenings, 1650-1995," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2WG-K5D : 11 February 2018), Mary Martin, ; citing SAINT JOHNS PARISH,PRINCE GEORGES,MARYLAND; FHL microfilm 14,303.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4D2-LBJ : 12 April 2016), Mary Underwood in household of Thomas Underwood, Wauwatosa, Milwaukee, Wisconsin, United States; citing family 89, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com/memorial/43013801/mary-underwood: accessed 27 May 2023), memorial page for Mary Martin Underwood (2 Oct 1768–unknown), Find a Grave Memorial ID 43013801; Burial Details Unknown; Maintained by MARTIN (contributor 47186620).
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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 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: