In the 1901 census transcription on Familysearch.org, , John is described as a cats washer. This should be CAB WASHER, the same occupation his father had in 1881/1891.
Sources
"England and Wales Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q27Q-M4XZ : 18 August 2016), John Groom in household of James Groom, Islington, London,Middlesex, England; from "1881 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing p. 41, Piece/Folio 226/79, The National Archives, Kew, Surrey; FHL microfilm 101,774,362.
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QWSL-63Z : 15 October 2015), John J Groom in household of James Groom, Islington, London, England; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, London county, subdistrict, The National Archives of the UK, Kew, Surrey.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9ZB-9T6 : 29 August 2015), John J Groom in household of James Groom, Islington, London, Middlesex, England; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Lower Holloway subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
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DNA Connections
It may be possible to confirm family relationships with John 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 John: