He was married to "Mary", who was the mother of William. In the 1930 Census, he is listed as divorced.
Sources
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9V6-XXG : accessed 21 February 2020), Louis Roy in household of Thomas Bary, Billings, Esby, Osnabrook & Perry Townships, Cavalier, North Dakota, United States; citing enumeration district (ED) 43, sheet 11A, family 254, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,227.
"North Dakota Census, 1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK94-GWCY : 17 March 2018), Louis Roy in household of Fred Roy, Cavalier, North Dakota, United States; citing family number , line number 63, State Historical Society of North Dakota; FHL microfilm 1,731,412.
"United States Social Security Death Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V92B-FXQ : 22 July 2020), Louie Roy, Nov 1962; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XKJ1-NZR : accessed 20 August 2020), Louis Roy in household of Erek L Haaven, Alma, Cavalier, North Dakota, United States; citing enumeration district (ED) ED 1, sheet 2A, line 25, family 28, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1734; FHL microfilm 2,341,468.
North Dakota Department of Health; Bismark, North Dakota; North Dakota Death Records [1]
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DNA Connections
It may be possible to confirm family relationships with Louis 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 Louis: