Jane Johnston – died 1 May 1916
Arthur Johnston – died 9 August 1937
Oliver John Johnston – died 1 September 1962
Margaret Joan Grant – died 3 March 1935
Oliver was born around 1884 but is not on NZ BDM nor is his marriage.
I have found one child of Oliver John and Jeanie (Jane) Johnston. James Arthur Johnston was born in 1914. He passed away in 1995.
The ‘child’ is Margaret Jane Grant who died on 3 March 1935. The child of David Leslie Grant and Emily Grace Flanagan. Margaret Jane is not mentioned on the tombstone.