Pierre, son of Pierre Dorai and Claire Primo, was born 20 May 1809 and baptized the same day in the parish of Saint-Joachim-de-Châteauguay, Châteauguay , Bas-Canada. 
Pierre Dorais, adult son of Pierre Dorais and the late Saint-Joachim-de-Châteauguay Claire Primeau, and Catherine Damour, minor daughter of Jean Baptiste Damour and the late Archange Barette, were married 3 Sep 1838 in the parish of Saint-Joachim-de-Châteauguay, Châteauguay, Bas-Canada. 
"Canada Census, 1881," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVNT-7SX : 30 June 2017), Pierre Dorais, Barford, Stanstead, Quebec, Canada; citing p. 32; Library and Archives Canada film number C-13199, Library and Archives Canada, Ottawa, Ontario; FHL microfilm 1,375,835.
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It may be possible to confirm family relationships with Pierre by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: