peoplesearch in Australia

A lot of European geni-users lost profiles in their ancestry when their grand-mothers-&-or-fathers decided to leave their birth-places and took their children to get boats & planes to explore new territories. Australian people might be able to help them to find their pedigree and join families again.

I have friends and relatives in Australia.Unfortunately Ilost the connection to them. It would be nice to find their contact information and build connection to them (again) here.
The sister of my mother Private lived for decades in Sidney, her doughter Mariann Erder lives probably also today in Sidney. How could Ifind her and her family.
The best friend of my mother (who visited Australia many times) were the Wenkarts(Juliska and Fred) It would be interesting tofind their roots (coming from Austro.Hungary) and living relatives (e.g. Tom Wenkart).