My great, great grandmother Mary Ryan's (Halloran) sister Margaret was married to John O'Sullivan. He worked for Swallow and Ariell in Sydney until his death in December 1908 aged 59 years. This article is one that I have found about him in Freeman's Journal.
Freeman's Journal 13th June 1885
St Joseph's Church Balmain West is now known as St Joseph's Rozelle. There is an interior photo of the three altars on this site - St Joseph's Rozelle. I wonder if these altars are still standing and if there is an acknowledgment of John O'Sullivan?
A visit to this church will be on my list of things to do next time I'm in Sydney.