First two given names from birth search of son on New Zealand BDM website in May 2020:
1906/13784. Smith, Edward George. Mother: Elsie Rose. Father: Sydney George

Maiden name, year and country of marriage from search on New Zealand BDM website in May 2020:
1901/5323. Bride: Elsie Rose Herbert. Groom: Sydney George Smith

Full date of marriage of 19 November 1901 from further searching in May 2020 on BDM Search by incrementally changing the date range for the marriage.

Year and country of birth from search on New Zealand BDM website in May 2020:
1878/833. Herbert, Elsie Rose. Mother: Ann. Father: George Henry

Full date of birth of 15 February 1878 from further searching in May 2020 on BDM Search by incrementally changing the date range for the birth.

Place of marriage, date of death of 3 April 1913, aged 35 [therefore born circa 1878] from:
https://www.findagrave.com/memorial/196999075

Children found in May 2020 from New Zealand Birth Death Marriages website:
1902/17608. Smith, Rosa Maud. Mother: Elsie Rose. Father: Sydney George
1905/16346. Smith, Ethel Mary. Mother: Elsie Rose. Father: Sydney George
1906/13784. Smith, Edward George. Mother: Elsie Rose. Father: Sydney George