"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/NQ11-5F2 : 18 May 2016), Arthur C Mckay, 10 Jan 1912; Chicago, Cook, Illinois, United States, reference/certificate 11585, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm 1,288,238.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJ7X-9RL : accessed 14 August 2018), Arthur Mckay in household of Arthur Mc Kay, Chicago Ward 31, Cook (Chicago), Illinois, United States; citing ED 1896, sheet 3B, line 54, family 61, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 348; FHL microfilm 1,820,348.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XSLK-WC7 : accessed 14 August 2018), Arelunae Mckay Jr. in household of Arthur Mckay, Chicago (Districts 0501-0750), Cook, Illinois, United States; citing enumeration district (ED) ED 610, sheet 24A, line 27, family 475, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 442; FHL microfilm 2,340,177.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JKC7-2MN : 20 May 2014), Arthur C Mckay, 18 Aug 1995; 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/QKGZ-CLGF : accessed 14 August 2018), Art in entry for Thomas J Mckay, Michigan, United States, 01 Nov 2001; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Flint Journal, The, born-digital text.
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DNA Connections
It may be possible to confirm family relationships with Arthur 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 Arthur: