Here are some McGillivray family details which may help to lead eventually to being able to contact relatives.....
Births:
1903/20840 McGillivray Marjorie Helen Sarah Elizabeth Robert -
1908/8148 McGillivray Lyla Mary Emily Sarah Elizabeth Robert -
1905/12331 McGillivray Bruce Sarah Elizabeth Robert -
1910/6239 McGillivray Douglas Stuart Michael Sarah Elizabeth Robert -
1915/26576 McGillivray Thomas Campbell Sarah Elizabeth Robert
Marriage:
1936/10875 Phyllis Knox Tucker Douglas Stuart Michael McGillivray
Death:
*2002/11901 McGillivray Phyllis Knox 19 June 1908
Death:
1956/31494 McGillivray Douglas Stuart Michael 46Y
Death:
1945/10514 McGillivray Thomas Campbell 26Y
Death:
*1992/50060 McGillivray Bruce 8 February 1905
Marriage:
1932/1227 Marjorie Helen McGillivray William Phillips
*These fairly recent deaths may be a good place to start.......
Added: probate for Bruce McGillivray which helps pinpoint where he resided.
https://www.archway.archives.govt.nz/ViewFullItem.do?code=19341418Minniehaha.