Hi Charlie,
It’s great to hear that you are tracing your Irish Family History!
Before 1864 records were kept in the form of church and parish records so the
National Library of Ireland may be a place to look for records of your great great grandparents.
In 1864 civil registration was introduced in Ireland, which is when we started seeing the formal registration of births, marriages, adoptions and deaths. These records have been kept at the
General Register Office of Ireland(GRO), through the
Irish Genealogy website, to this day. The National Archives has some information on the
Church of Ireland records with links to websites that may help too.
Records from within the last 100 years are not available online for privacy reasons.
Have you been able to trace where they were from originally and any possible relatives before they left for Australia?