Olsen children

I am trying to find if and or all of the siblings of Frederikke Olava Olsen emigrated to New Zealand. (she came in 1879 on the Arethusa ex London) The children concerned are: Hans Jacob Olsen - born c1853 Caroline Olsdatter - born 1855 Karen Olsdatter - born 1860 Marie Olsdatter - born 1863 We have a photo taken in NZ about 1909 which shows Wilhelm Anderson and his wife Olava and their son Emil (my grandfather) and Olive, Emil's sister. I don't know who the others are but the ladies THree) certainly bear a resemblence to Olava - and thre are also three extra men (possibly spouses of the ladies) hence our desire to find if they came to NZ. Photo is here http://www.rootschat.com/forum/index.php?action=dlattach;topic=296795.0;id=105500;image Don L