Hello from Perth, Australia. We have a family of Quirke children who arrived unescorted in NSW in 1883,(on the ship "Rialto") named Mary 16yrs, Thomas 1871, Johanna 1873. They are believed to have been met by their sister. Having read your post, I wonder if they were in fact met by their sister-in-law, who could have been your Jeremiah Quirke's wife. I hope you can provide some links for us.