Found a reference to Mary St Q at school ChCh June 1870; the 'Mrs Miss and Master' who left on the Albion in November 1870 may have been Sarah Ann, Victor and Mary. Did the other twin die?
Found ref to an anonymous and seemingly threatening letter sent to St Q in Feb 1870. Was that what prompted him to flee NZ?
Strange coincidence in light of the Melbourne connection - the carpenter killed in the steam boat collision in Port Chalmers in 1863 had been employed by St Q in Ballarat; the boat's name was the Pride of the Yarra.