First two given names, from New Zealand Electoral Roll - New Plymouth main Roll 1963, found in June 2020:
Rowlands, Sydney George, 20 Nobs Line, local body officer
Rowlands, Berna Olive, 20 Nobs Line, married
Rowlands, Barry Sydney, 20 Nobs Line, joiner [Son]

Maiden name, year and country of marriage from search on New Zealand BDM website in June 2020:
1937/2773. Bride: Berna Olive Johnston. Groom: Sydney George Rowlands

Full date of marriage of 24 March 1937 from further searching in June 2020 on BDM Search by incrementally changing the date range for the marriage.

Year and country of death, date of birth, from death search on New Zealand BDM website in June 2020:
1989/37801. Rowlands, Berna Olive. Date of birth: 14 February 1907

Full date of death of 25 April 1989 from further searching in June 2020 on BDM Search by incrementally changing the date range for the death.