"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9XK-QBT : 20 May 2019), Patrick M S Blackett in household of Arthur S Blackett, Coulsdon, Surrey, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Croydon subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XWQ4-6DC : 5 April 2022), Patrick M S Blackett, Whippingham, Isle of Wight, Hampshire, England, United Kingdom; from "1911 England and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 14, The National Archives of the UK, Kew, Surrey.
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