I am the great, great grandaughter of John O'Callaghan and Ngawaara Tamihana, I can't find much on info on John, they had a son Whakarongotai (Tai) O'Callaghan who was born 3 Aug 1893, one of Tai's children is my grandmother Eileen Te Oneroa MacPherson (nee O'Callaghan) who passed away in May 1990 in Rotorua and she had a brother Poraumati O'Callaghan.
I have found in the N.Z Archives and the old canterbury website that a "John O'Callaghan" owned a cutter called the "Leah", in Papers Past there is a John O'Callaghan an old resident of Cardona that died 3 July 1913, I am not sure if this is my great, great grandfather. I live in Australia now and am trying to research my family tree.
Any information would be much appreciated.