Butterworth married Rosa Winifred Pryke, daughter of Edward Pryke and Iris Fanny.1 (Rosa Winifred Pryke was born on 1 Aug 1887 in Haughley, , Suffolk, England 2 and died on 22 Jan 1972 in Haughley, , Suffolk, England 2.)
1 Birth Certificate, Birth Certificate for Zena Iris Blanche Sillett. Cit. Date: 10 Mar 2005.
2 England and Wales, Death Certificate for Rosa Winifred Sillett, died 22nd January 1972; citing 4b/2761/99, March quarter 1972, Gipping registration district, Needham and Stowmarket sub-district; General Register Office, Southport. Cit. Date: 25 Aug 2014.