"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSCC-WQL : 21 May 2019), Frederick Abernethy in household of Elizabeth J Abernethy, Sunderland, Durham, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing South Bishop Wearmouth subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
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