Name from birth search of son on New Zealand BDM website in July 2020:
1890/7541. Milne, Harold Douglas. Mother: Margaret. Father: John

Year and country of marriage from search on New Zealand BDM website in July 2020:
1873/6469. Bride: Margaret Craighead. Groom: John Milne

Full date of marriage of 14 May 1873 from further searching in July 2020 on BDM Search by incrementally changing the date range for the marriage.