↑ "Canada, Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:J68P-H35 : 2 March 2021), Burton Underhill, 2 May 1902; citing Houghton, Norfolk, Ontario, Canada, , Registrar General. Archives of Ontario, Toronto; FHL microfilm .
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Which suggests the father was Robert J Underhill, who you currently show as a brother.