Levi is listed as D. Levy in the 1901 Census. I believed this to be a transcription error. However, he is listed as age 19, which would fit with his birth year of 1882.
In the 1891 Census, there is someone named "David", aged 6, which doesn't quite match to the correct age. (If he was born in 1882 he would be 9 by the 1891 Census).
Further searching found that on January 12, 1922, David H. Terrio, aged 38, (Father Abram Terrio and Mother Julie LaVache), married Marie Boudreau, aged 24 (Father Stephen Boudreau and Mother Marie Anne Grenon) in Arichat, and Notre Dame de L'Assomption. Witnesses were Samuel Vigneau and Eleonore Boucher.
Finally, I was able to find a death certificate, under the name David Terrio, s/o Abraham Terrio and Julie LaVache, spouse of Maria Boudreau.
Sources
Arichat Church Records, Notre Dame de L'Assomption [1]
"Canada Census, 1891," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW2W-VDW : 3 August 2016), David Terris, Arichat, Richmond, Nova Scotia, Canada; Public Archives, Ottawa, Ontario; Library and Archives Canada film number 30953_148122. [2]
"Canada Census, 1901," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KH2S-62G : 27 April 2017), D Levy Theriault in household of Julia Theriault, Richmond, Nova Scotia, Canada; citing p. 2, Library and Archives of Canada, Ottawa. [3]
Arichat Church Records, Notre Dame de L'Assomption [4][5]
Arichat Church Records, Notre Dame de L'Assomption [6]
Arichat Church Records, Notre Dame de L'Assomption [7]
Nova Scotia Vital Statistics, Death Regisration, accessed Sept. 20, 2017 by Jillian Theriault [8]
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DNA Connections
It may be possible to confirm family relationships with David 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 David: