You need to provide their "Details" if you want any assistance ...
Preferably, their 'FamilySearch Person Identifiers' (PIDs), if they are in "Family Tree" of "FamilySearch" ...
from "Down Under"
There is also a @Australian Genealogy group that can help you with suggestions for research.
When you have a few moments, please--if possible--share what little details you might have with us and there are some excellent responders here in this Australia Group who are very skilled to assist you.
FYI: if you are researching in the post-1837 era, you--
All the best!