Here is the obituary you mentioned:
paperspast.natlib.govt.nz/cgi-bin/paperspast?a=d&cl=search&d=EP19230929.2.69&srpos=16&e=-------10--11----2john+dumbell--
And his wife Ellen's:
paperspast.natlib.govt.nz/cgi-bin/paperspast?a=d&cl=search&d=EP19031111.2.24&srpos=64&e=-------10--61----2john+dumbell--
Sue