"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPTL-C92 : accessed 12 April 2021), Harry I Cahill in household of Joseph D Cahill, Lake Charles Ward 1, Calcasieu, Louisiana, United States; citing enumeration district (ED) ED 35, sheet 23B, family 499, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 511; FHL microfilm 1,374,524.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ8Z-34N : 22 February 2021), Harry Joseph Cahill, 1917-1918.
"Louisiana Parish Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKJ4-G6YM : 17 February 2021), Harry J Cahill and Daisy M Hay, 12 Feb 1923; citing Calcasieu, Louisiana, United States, various parish courthouses, Louisiana; FHL microfilm 1,405,702.
"Louisiana Parish Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKJ4-GLFP : 17 February 2021), Harry J Cahill and Daisy M Hay, 12 Feb 1923; citing Calcasieu, Louisiana, United States, various parish courthouses, Louisiana; FHL microfilm 1,405,695.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMYM-CPF : accessed 12 April 2021), Harry Cahill, Lake Charles, Calcasieu, Louisiana, United States; citing enumeration district (ED) ED 4, sheet 16A, line 18, family 352, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 788; FHL microfilm 2,340,523.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VYRV-G4R : 5 January 2021), Harry J Cahill, Ward Three, Calcasieu, Louisiana, United States; citing enumeration district (ED) 10-4, sheet 30A, line 31, family 579, 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 1390.
Find a Grave, database and images (https://www.findagrave.com : accessed 12 April 2021), memorial page for Harry Joseph Cahill (29 Jul 1898–29 Aug 1983), Find a Grave Memorial no.Find A Grave: Memorial #22879515, citing Prien Memorial Park Cemetery, Lake Charles, Calcasieu Parish, Louisiana, USA ; Maintained by Rita A Bomher (contributor 47319873) .
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DNA Connections
It may be possible to confirm family relationships with Harry 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 Harry: