Birth record of son Henry Hallam shows the spelling as Sanderson "Ontario Births, 1869-1912", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FM37-MCS : accessed 8 September 2015), Laura J Allen in entry for Henry Hallam Sanderson, 1871.
Marriage record of his daughter Clara shows his name as Edward A. "Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKM5-43R7 : accessed 8 September 2015), Laura Allen in entry for David Maxwell Crombie and Clara A Lewis, 29 May 1918; citing registration , Peterborough, Peterborough, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 2,171,002.
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