Looking for Haig of New Zealand

My Great-Grandparents, James and Isabella Haig arrived in Lyttelton NZ aboard the maiden voyage of the Canterbury from Clydeside Scotland. With them were their Children: William Reid b 09/09/1858-my Grandfather), Mary Jack (b10/09/1860) - who married George Martin; James Alexander Allison (b27/08/1863); Margaret Blair (b31/08/1868) - died Kaiapoi NZ unmarried; John Mcewan (b 25/04/1872) m Beatrice Jane Dowdle. Isabella then gave birth to Alexander Blair and Joseph Boyd Marquis in NZ. My Great-Great-Grandparents were James and Mary (nee Jack) of Lanark Glasgow. James parents it appears were William Haig and Marion McFarlane.
Apart from my own direct line from William Reid Haig, I know very little of his other 6 siblings or their offspring. When I was born my Father (William Bruce Haig) was 43, and considerably younger than his four Sisters. Unfortunately all of that generation has passed on - and being of dour Scots lineage, did not say or record very much at all of their past. Any help gratefully received.