Marriage record says his parents were John A. and Sarah (Petite) Chisholm.
Sources
Ancestry Family Trees submitted by Ancestry members.
"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMFT-MNP : 11 March 2018), William Bigger Chisholm and Mary Rebecca Howse, 27 Nov 1872; citing registration , Oakville, Halton, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,862,696.
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