First wife was Mary Jane McNaught. In 1881, his wife was Barbara.
Sources
"Canada Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVNQ-BFJ : 2 March 2021), Damien Arseneau in household of Timotthy Gallant, Lot 6, Prince, Prince Edward Island, Canada; from "1881 Canadian Census." Database with images. Ancestry. (www.ancestry.com : 2008); citing Timotthy Gallant, citing Library and Archives Canada, Ottawa, Ontario.
"Canada, Prince Edward Island Baptism Card Index, 1721-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCXZ-469 : 8 March 2021), Damien Arseneaux in entry for William Arseneaux, 01 Mar 1875; citing p. 111, volume 1, , Prince Edward Island, Public Archives, Charlottetown; FHL microfilm 1,487,750.
"Canada, Prince Edward Island Baptism Card Index, 1721-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCXZ-3ZP : 8 March 2021), Damien Arsenault in entry for James Arseneault, 24 Feb 1861; citing p. 128, volume 2, , Prince Edward Island, Public Archives, Charlottetown; FHL microfilm 1,487,750.
"Canada, Prince Edward Island Marriage Registers, 1832-1888," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVBJ-2XMX : 20 February 2021), Damian Arsenaux and Mary Jane McNaught, 27 Jan 1861; citing , Prince Edward Island, Canada, Public Archives, Charlottetown; FHL microfilm 1,630,092.
"Canada, Prince Edward Island Baptism Card Index, 1721-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCXZ-QGB : 8 March 2021), Damien Arseneaux in entry for Mary Jane Arseneaux, 01 Mar 1875; citing p. 111, volume 1, , Prince Edward Island, Public Archives, Charlottetown; FHL microfilm 1,487,750.
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DNA Connections
It may be possible to confirm family relationships with Damien by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Roland Arsenault :
Family Tree DNA Y-DNA Test 37 markers, haplogroup R-BY210, FTDNA kit #N109286 +
Y-Chromosome Test, haplogroup R-Y22123
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Damien: