Looking at Electoral rolls I wonder if they divorced/separated. in 1937 Hubert William senior is at St Catherine Tce, Wynumsame address a Mabel Alice Maltby. No Janet.
https://www.mytributes.com.au/notice/death-notices/maltby-diana-joy/3845571/MALTBY, Diana Joy (Joy) Late of Wynnum North. Passed away peacefully 20th September, 2012. Aged 91 Years Dearly loved Wife of Hugh (dec'd). Much loved Mother and Mother-in- law of ...
Quote from: cupoflife on Thursday 04 November 21 07:21 GMT (UK) https://www.mytributes.com.au/notice/death-notices/maltby-diana-joy/3845571/MALTBY, Diana Joy (Joy) Late of Wynnum North. Passed away peacefully 20th September, 2012. Aged 91 Years Dearly loved Wife of Hugh (dec'd). Much loved Mother and Mother-in- law of ...Not sure?Hemmant Cemetery and Crematoriumhttps://www.findagrave.com/memorial/193693973/diana-joy-maltbyDiana Joy MaltbyBIRTH: 30 Oct 1920DEATH: 20 Sep 2012 (aged 91)https://www.findagrave.com/memorial/193693974/hugh-william-maltbyHugh William MaltbyBIRTH: 12 Jun 1920DEATH: 28 Jun 2006 (aged 86)
any connection Elizabeth Olive Campbell Maltby marries Thomas Richard Finning 1938 - Victoria , Australia https://en.geneanet.org/cercles/view/colgnecmmarriagesaus/1651937
The son Ernest died 1965 in Birmingham. Probate entry in 1966.