The 1921 census shows the entire family plus (probably) a sister of Marie-Louise 'Cordelia Blache' living with them. Also I think that one or more children did belong to Cordelia.
Sources
1885 Mariage entre Jeremie Belair et M.Louise Blacke "Canada, Québec, registres paroissiaux catholiques, 1621-1979," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:3QSQ-G993-4762?cc=1321742&wc=HZLC-2NL%3A16470801%2C41684401%2C15078701 : 16 July 2014), Montréal > Sainte-Cunégonde > Baptêmes, mariages, sépultures 1883-1899 > image 256 of 2228; Archives Nationales du Quebec (National Archives of Quebec), Montreal.
(https://familysearch.org/ark:/61903/1:1:MVJY-D5J : 20 May 2019), Jeremie Belair in household of Ve.Jeremi Belair, Hochelaga, Quebec, Canada; from "1881 Canadian Census." Database with images. Ancestry. (www.ancestry.com : 2008); citing Ve.Jeremi Belair, citing Library and Archives Canada, Ottawa, Ontario.
"Canada Census, 1891," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWPV-F5Q : 3 August 2016), Jeramie Belair, St Henri Town, Hochelaga, Quebec, Canada; Public Archives, Ottawa, Ontario; Library and Archives Canada film number 30953_148199.
"Canada Census, 1901," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KHPB-KZS : 16 December 2019), Jèrèmie Bèlair, Hochelaga, Quebec, Canada; citing p. 9, Library and Archives of Canada, Ottawa.
"Recensement du Canada de 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVBW-PJXW : 16 March 2018), Therese Belair in entry for Geremie Belair, 1911; citing Census, Jacques-Cartier Sub-Districts 16-60, Quebec, Canada, Library and Archives of Canada, Ottawa, Ontario; FHL microfilm 2,418,550.
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