Mary Virginia Peters was born on 25 December 1864 in Detroit, Michigan, the daughter of David Peters and Melisse Sophie Mercure. Mary married Thomas McCarhy in 1893 in Detroit, Michigan. They had (at least) three children. 
In 1870, the Peters family lived in Detroit, Wayne, Michigan. The family included
David Peters, 48, born in Canada, a moulder, with $2500 in real estate, who could not read or write
Sophia Peters 43 Maine, could not read or write
Octave Peters 18 Michigan, apprentice to a machinist
Samuel Peters 14 Michigan, in school
Adelia Peters 12 Michigan, in school
David Peters 10 Michigan, in school
Mary Peters 5 Michigan
Joseph N Peters 10 months, born in Aug. 1869, in Michigan
Thomas McCarthy, 27, and May V. Peters, 26, were married in Wayne, Michigan on 17 October 1893. Thomas was the son of Charles and Margaret (Gormbey) McCarthy. May was the daughter of David and Sophia (Mercure) Peters. 
In 1900, the McCarthy family lived their rented house at 352 22nd St., Detroit, Wayne, Michigan. The household included
Thomas Mccarty, 36, born in Michigan in Nov. 1864, parents b. Ireland, an electrician, married seven years
Mary Mccarty Wife 36 b. Michigan, Dec. 1864, father b. Michigan, mother b. Maine; had had four children, three of whom were living
David Mccarty Son 6 b. Michigan, Aug. 1894
Charles Mccarty Son 1 b. Michigan, June 1899
Emily (SOPHIE) Peters, Mother, 75, b. Maine, May 1825, parents b. Maine, a widow, who had had 12 children, five of whom were living
↑ "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHCY-H22 : 12 April 2016), Joseph N Peters in household of David Peters, Michigan, United States; citing p. 43, family 305, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,214.
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M91Q-C47 : accessed 7 February 2022), Mary Mccarty in household of Thomas Mccarty, Detroit city Ward 12, Wayne, Michigan, United States; citing enumeration district (ED) 134, sheet 6B, family 126, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,752.
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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: