In 1937, Jones married
Pearl "Polly" Binder, an artist from Manchester. The couple had three children: Josephine, Lou and
Dan. Josephine became a researcher on
Jacob Bronowski's TV series
The Ascent of Man and married Francis Gladstone (a great-grandson of Prime Minister
William Gladstone). Dan Jones is an artist, collector of children's playground songs and
human rights campaigner. Elwyn-Jones's brother
Idris (1900–1971) was captain of the
Wales rugby union team in 1925, and was an industrial chemist who became Director General of Research Development for the
National Coal Board. Elwyn-Jones died in December 1989, aged 80. ==Arms==