William was born in 1903 in Sandholme, Yorkshire, England, and was baptised nearby in Eastrington. He was the son of Richard Overend and Hannah Laverack; the family lived in Sandholme in 1911.
↑ GRO birth index. OVEREND, WILLIAM. Mother LAVERACK. GRO Reference: 1903 S Quarter in HOWDEN Volume 09D Page 94. GRO.gov.uk
↑ Baptisms in the parish of Eastrington. 6 Sep 1903. William, son of Richard Scruton (farmer) & Hannah Overend of Sandholme. Yorkshire Baptisms transcripts. findmypast.co.uk. Accessed 17 Jan 2020
↑ "England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7RB-2FV : 18 July 2019), William Overend in household of Richard Overend, Gilberdike Mill, Yorkshire East Riding, 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.