James Richardson - went to NZ

[ElizabethHerts]

One of the brothers of my 2gt-grandmother was James Richardson, born 14th October 1853 at Grange, Banffshire, Scotland.

He emigrated to New Zealand c. 1883.
I have a transcript of a letter he wrote to one of his sisters in 1900. He states he has three boys and two girls, the eldest boy being 14 and the youngest 3. The second child, a boy, died aged 3.

This is all I know about his life in New Zealand, except I think he was a gardener. I don't even know his wife's name and whether he married in Scotland or New Zealand.

Any advice on finding the family in NZ would be welcome.