I am an Australian descendant of Julian Porteils, although I did not know this till very recently. The surname left my family line when my mother was adopted (she was born Myrtle May Porteils in 1940), and i have been researching the line in Australia, but have no information on parents or ancestry back beyond Julian (although i believe his parents were Jacques and Veronica). If you wish, i can post the information I have on the Australian descendants, and perhaps you could help me with the french side.
However, i am not sure about his wife travelling with him, as there is an Australian marriage certificate for Julian Porteils and Marguerite Ryan, married 1886 in Sydney. Perhaps a second marriage out here?