In 1901, Sydney is working at Kew, aged 16, as a Bank Clerk. He marries in 1914 Unknown Pipe and has at least three children :- Eileen M., Brian H., & Michael.
Sources
"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2XLT-3JN : 1 October 2014), Sydney Tom Hooley, 1884; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, Wandsworth, London, England, citing General Register Office, Southport, England.
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QD4K-WT2 : 22 February 2021), Sydney T Hooley in household of Thomas Hooley, Isleworth, Middlesex, England, United Kingdom; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, Middlesex county, subdistrict, The National Archives of the UK, Kew, Surrey.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9XV-7DX : 20 May 2019), Sydny T Hooley in household of Thomas C Hooley, Kew, Surrey, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Richmond subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XWW5-5SP : 5 July 2019), Sydney Tom Hooley in household of Thomas C Hooley, Heston, Middlesex, 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.