"Utah, Salt Lake County Birth Records, 1890-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XXX7-2Q2 : 20 February 2021), Dennison Mayo Copp, 02 Sep 1907; citing Salt Lake, Utah, page 166, line 6632, Records Manager and Archive, Salt Lake City; FHL microfilm 4,121,052.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M5XQ-PCB : accessed 27 February 2021), Dennison M Copp in household of Henry W Copp, Salt Lake City Ward 2, Salt Lake City, Salt Lake, Utah, United States; citing enumeration district (ED) ED 117, sheet 7A, family 170, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1606; FHL microfilm 1,375,619.
"United States Census, 1920," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M8PB-CLL : accessed 27 February 2021), Denison M Copp in household of William H Copp, Salt Lake, Utah, United States; citing , sheet , line , family , NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll ; FHL microfilm .
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH6F-4SQ : accessed 27 February 2021), Denny M Copp in household of William H Copp, Salt Lake City, Salt Lake, Utah, United States; citing enumeration district (ED) ED 39, sheet 8A, line 14, family 158, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2419; FHL microfilm 2,342,153.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP6K-QNF : 26 November 2014), Dennison Mayo Copp, 28 Feb 1988; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with Dennison by comparing test results with other carriers of his Y-chromosome or his mother's 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 Dennison: