"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3KV-X2P : accessed 4 April 2021), Holie H Mccormick in household of Albert Mccormick, Precinct 10 Baltimore city Ward 16, Baltimore, Maryland, United States; citing enumeration district (ED) 211, sheet 10B, family 180, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,615.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGZL-X29 : accessed 4 April 2021), Hollie H Mccormick in household of Albert L Mccormick, Philadelphia Ward 34, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 839, sheet 2B, family 32, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1406; FHL microfilm 1,375,419.
"United States Passport Applications, 1795-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVR2-G1M1 : 16 March 2018), Hollie H Mccormick, 1920; citing Passport Application, Canada, source certificate #33971, Passport Applications, January 2, 1906 - March 31, 1925, 1206, NARA microfilm publications M1490 and M1372 (Washington D.C.: National Archives and Records Administration, n.d.).
"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMFN-LPM : 8 March 2021), Neil E Mckinnon and Hollie Harrison Mccormick, 15 Aug 1924; citing registration , Bracebridge, Muskoka, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,838,210.
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DNA Connections
It may be possible to confirm family relationships with Hollie 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 Hollie: