I am not related but can I help with any info?
I see online that they were married in 1898 and he died in 1942.
Burial as follows.
Source NZSG Cemetery Fiche
Surname OSBORNE
Given Names Robert Howard
Year of Death 1942
Record Number 709
Record Type M/I
Age 72
Location Maunu Cemetery A06.
I see seven childrens births registered to them