Hi,
If you are trying to trace the descendants you might try the searchable online Births Deaths and Marriages. I can give you the url if you need it. Also there are a number of genealogical mailing lists eg. Australia-D and also newsgroups which could flush out some relatives who may have lots of info. I live near the State Archives and could possibly help if you can forward the details. My email is: tracks@fl.net.au