Thank you so much for all the information you've provided. Linking family legend with facts can be quite a process!
According to my grandparents Laurtis had come out on his own and jumped ship in Melbourne, hence the name change. So it never actually occurred to me to look to see if his brothers had come to Australia.
As it turns out, that is the record for his brother Jacob and I also have located the descendents of his other brother Peter living in Port Adelaide.
This side of the family is finally starting to come together which is really nice.