In the 1901 Census he and his older brother Robert are found in Ballyman, Rathmichael, County Dublin, with Benjamin and Elizabeth Taylor. Elizabeth was their aunt Elizabeth Clarke, sister of their mother Rebecca Clarke. Benjamin Taylor and Elizabeth Taylor describe themselves as gardener and domestic servant, and are living in Ballyman in a 2 room house leased from Philip Barrington.
James married Dorothy Eileen Clarke, his first cousin, in 1923, in Pwllheli, Caernarvonshire, Wales.
1923 September 24. James George Alexander Biddulph, 29, Bachelor, Motor Mechanic, 10 Castle St Criccieth, son of Nicholas William John Biddulph, Clerk in Holy Orders,married Dorothy Eileen Clarke, 24, Spinster [no occupation given], 10 Castle St, daughter of George Clarke, Gardener, witnessed by Lizzie Griffiths and William Griffith Evans (GAS XPE 72/7). Bride and groom were first cousins: his mother Rebecca was sister to Mary Jane Griffiths née Clarke(EJ).
Dorothy died in 1939 and is buried in the cemetery at Criccieth. James died in Ealing, London, in 1967. He too is commemorated on the gravestone in Criccieth.
The stone recorded by the Gwynedd Family History Society has now been replaced with one that commemorates ‘MARY JANE GRIFFITHS / 1864-1934 / GRIFFITH GRIFFITHS / 1863-1944 / BOD HYWEL, CRICCIETH / ALSO THEIR DAUGHTERS / LIZZIE GRIFFITHS / 1903-1996 / DOROTHY EILEEN / 1898-1939 / and her husband JAMES BIDDULPH / 1894-1967