I have a marriage certificate for John Johnston and Eliza Jane Brown married 26th July 1887 in Wanganui, New Zealand which I ordered thinking this was the John from my tree. These are the details in case this is someone elses John or Eliza Jane.
John was born in Braidwood NSW, Australia and his parents are John Johnston and Mary Lahey. Eliza was born in Tasmania and her parents are James Brown and MaryAnne Dainty. John was a post office clerk in Wanganui but they later moved to Wellington. John died in 19 March 1933 aged 75 - there is a little write up about him in the Evening Post on 20 March 1933. Eliza Jane died around the 7 May 1945 also aged 75. Both are buried in Karori Cemetery Wellington.
They had three children: Jamie Annie 1893,
Gladys Mary 1895
John James 1906.
Jamie annie married Paul Hiram Leslie John Simpson and lived in Auckland - her name is listed as Jennie in the online marriages.
John James married Thelma May Murdoch in 1932.
Not sure what happened to Gladys.
Hope this is useful to someone.