I don't have any experience searching records in New Zealand, but thought I would try to help if I could.
What I found for you:
Burial infomation and obituary for Robert Divehall, b. England
DIVEHALL, Infant Stillborn 8 Jan 1880 TE HENUI
DIVEHALL, Mary Ann Not recorded Not recorded TE HENUI
DIVEHALL, Robert Not recorded Not recorded TE HENUI
Infant Divehall is the only one with a date of birth/death.
Mary Ann and Robert Divehall lived at the same address according to cemetery records, she is listed as a widow.
Annie Esther May DIVEHALL b. 1881, m. 1900, d. 1951
Parents: Robert and Mary Ann DIVEHALL
Also found this obituary for Robert Divehall in the following publication:
Hawera & Normanby Star, Volume XLII, 18 August 1923, Page 6
Obituary copy is attached and has quite a bit of information for you.
Hope this helps.