Harry Wischhusen was born in 1899. He was the son of Henry Wischhusen and Alice Hayes.  Note that both Harry's last name and his mother's maiden surname were a bit confused in the transcription for the GRO.
In 1901, Harry was living with his parents and older sister, Lilian, in Wood Green, Middlesex. 
In 1911, Harry was the only son of five children in the household of his parents. The family were still living in Wood Green, Middlesex. 
↑ England & Wales General Register Office, GRO Online Index - Birth (https://www.gro.gov.uk/gro/content : accessed 4 February 2020), database entry for Wochuecn, Henry John (Mother's maiden surname: Haynes), GRO Reference: 1899 D Quarter in Edmonton, Volume 03A Page 459.
↑ "England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X96J-TD4 : 20 May 2019), Henry Wischhusen in household of Henry Wischhusen, Wood Green, Middlesex, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Tottenham subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
↑ "England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XW4K-C8M : 5 July 2019), Harry Wischhusen in household of Harry Wischhusen, Wood Green, 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.