"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJVZ-Z1K : accessed 4 September 2019), Oliver Dore in household of Joseph Cayer, Warwick, Kent, Rhode Island, United States; citing ED 20, sheet 22B, line 64, family 489, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1671; FHL microfilm 1,821,671.
"Rhode Island State Census, 1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV4Q-C8W : 11 March 2018), Oliver Dore in household of Joseph Cayer, Scituate, E.D. 334, Providence, Rhode Island; citing p. 15, line 4, State Archives, Providence; FHL microfilm 1,769,847.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMZT-7Q5 : accessed 4 September 2019), Oliver Dore in household of Joseph Cayer, Scituate, Providence, Rhode Island, United States; citing enumeration district (ED) ED 274, sheet 1B, line 81, family 23, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2173; FHL microfilm 2,341,907.
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DNA Connections
It may be possible to confirm family relationships with Olivier 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 Olivier: