Hi Kris,
To my knowledge Fred was the only member to come to NZ, there was never any mention of siblings in NZ, the shipping records will hopefully enlighten us when found. Fred & Ada only mentioned Fred having two sisters - in Fred's eyes they were very intelligent, giving the impression they were younger than Fred but obviously they were in fact older.
Thank you so much for all the help. A great find including Fred's siblings children. That area was mentioned on Fred's birth certificate. Were you able to find Fred in the family anywhere from your searches, birth cert page 333 Book 272 District of Hindmarsh, SA.
Regards
Kiwi