"England and Wales Census, 1871", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VFJ6-R9N : 28 September 2019), William John Grenfell in entry for Edward Grenfell, 1871.
"England and Wales Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q27H-P46Z : 11 December 2017), Wm John Grenfell in household of Edward Grenfell, St Just In Penwith, Cornwall, England; from "1881 England, Scotland and Wales Census," database and images, findmypast (http://www.findmypast.com : n.d.); citing p. 30, Piece/Folio 2350/70, The National Archives, Kew, Surrey; FHL microfilm 101,774,209.
Ancestry.com. 1891 England Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2005. The National Archives of the UK (TNA); Kew, Surrey, England; Class: RG12; Piece: 1860; Folio: 178; Page: 1 Ancestry Record 6598 #25547394
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: