Re: Seeking Australian family of the late ANN LEIGH (born Hania Helfgott)
Just 2 Helgott listed in the telephone book. Might be as start.
You might also try contacting Australian concert pianist David Helfgott via his website.
This is Hania's displaced persons card - https://collections.arolsen-archives.org/G/ITS_DATA_EXPORT_DP/03010101/0961/5700685/001.jpg
This might be Jrene listed - https://collections.arolsen-archives.org/G/wartime/02010101/0325/1405718/001.jpg