His mother, Margaret Serpine "Maggie" Lamb-Smith (1853-1938), née Gemmell - who had married William in St Kilda, Victoria on 19 April 1883[REF] - was the daughter of Hugh Mitchell Campbell Gemmell (1827-1880), and Simonette Marie Gemmell, née Christiani (1824-1888).
Gemmell's only sibling, Mora Marie Lamb-Smith (1884-1945),[REF] was a trained nurse [REF].