George William HALL and Sarah (Sarah Jane)BORTICK/BORTHWICK were married in County Longford, Ireland, in 1863, and were in New Zealand by 1875. George's father is said to have been George John HALL & his mother, Margaret ARMSTRONG (b.1815). Sarah's father, Thomas Edward BORTHWICK.
They had 2 children in NZ, but any born before then (Ireland? Australia?)are not known.
In one of the Irish Roots sites, the name BORTHWICK is said to be very rare in Ireland. It is of Ulster-Scots origin, occurring in Griffith's only 7 times - in Antrim & Belfast City. There is the same result for HALL/BORTHWICK households.
Some of the Halls were in the Waikato from the late 1870s onwards.