"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X4WK-3L2 : accessed 14 May 2018), Mary E Mccain in household of Harold B Mccain, Cross Creek, Jefferson, Ohio, United States; citing enumeration district (ED) ED 3, sheet 13B, line 93, family 158, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1824; FHL microfilm 2,341,558.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JY8Y-ZPL : 19 May 2014), Mary E Mccain, 06 Dec 2001; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVT5-FLZ8 : accessed 14 May 2018), Mary E Mccain, Pennsylvania, United States, 10 Dec 2001; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Pittsburgh Tribune-Review, born-digital text.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVTP-CPRQ : accessed 14 May 2018), Mary E Mccain, Pennsylvania, United States, 09 Dec 2001; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Pittsburgh Post-Gazette, born-digital text.
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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: