"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF51-69J : accessed 19 February 2017), Elizabeth Oconnor in household of John F Oconnor, McKeesport Ward 10, Allegheny, Pennsylvania, United States; citing ED 237, sheet 3A, line 43, family 55, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1515; FHL microfilm 1,821,515.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCH2-5BB : accessed 19 February 2017), Elizabeth Oconnor in household of Elma Oconnor, McKees Rocks, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 657, sheet 10B, line 69, family 193, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1966; FHL microfilm 2,341,700.
"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VFQJ-7LB : 24 June 2016), Joseph John Oestreicher and Elizabeth Mary O'Connor, 1939.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQWX-C2H : accessed 12 March 2017), Elizabeth Oestreicher in household of Joseph Oestreicher, Ward 21, Pittsburgh, Pittsburgh City, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 69-619, sheet 8B, line 74, family 157, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3671.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JYSL-NML : 20 May 2014), Elizabeth M Oestreicher, 04 Oct 1992; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with Elizabeth 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 Elizabeth: