Mary was born in 1860 in Randolph, the daughter of Elisha Mann and Sarah Jane Howard.
Her and her husband, Horatio Bingley Alden III., had 2 children.
Sources
"Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N431-J5V : 10 March 2021), Horatio B. Alden Jr. and Mary Ellen Mann, 19 Jun 1879; citing Randolph, Randolph, Norfolk, Massachusetts, United States, State Archives, Boston; FHL microfilm 1,433,040.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9YL-394 : accessed 7 January 2022), Mary E Alden in household of Horatio B Alden, Precinct 6 Boston city Ward 20, Suffolk, Massachusetts, United States; citing enumeration district (ED) 1463, sheet 21B, family 473, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,686.
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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: