The Browitt family were travelling on the Ovation of the Seas cruise ship, celebrating Krystal's 21st birthday.
The father, Paul and the two daughters, Stephanie and Krystal, decided to visit White Island, while their mother, Marie (Drakatou), chose to stay on the ship.
Ms Browitt is currently by Stephanie's side, in a hospital in Christchurch, while Paul Browitt has been transferred to Alfred Hospital in Melbourne.
A GoFundMe page has been setup to help the family.