"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5XS-MHZ : accessed 19 June 2017), D Lawrence Mckay in household of David O Mckay, Ogden Ward 4, Weber, Utah, United States; citing enumeration district (ED) ED 229, sheet 9B, family 192, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1611; FHL microfilm 1,375,624.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8PP-PK3 : accessed 19 June 2017), Laurence Mc Kay in household of David Mc Kay, Ogden Ward 4, Weber, Utah, United States; citing ED 161, sheet 7B, line 59, family 176, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1869; FHL microfilm 1,821,869.
"Utah Marriages, 1887-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F8P7-9LZ : 5 December 2014), David Lawrence Mckay and Mildred Dean Calderwood, 28 Jun 1928; citing Salt Lake City, Salt Lake, Utah; FHL microfilm 429,125.
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DNA Connections
It may be possible to confirm family relationships with David by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with David: