You have pointed out the common problem of using family trees created by other people. They are full of misinformation and often undocumented.
You did not give us the surname of your ancestor or where he lived in England before going to Australia, so it is difficult to assist you. This site is part of the National Archives & Records Administration in the US, not part of the British National Archives or the Australian National Archives. Did your ancestor ever live in the US?
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Dear Leonie Peers,
Thank you for posting your request on History Hub!
For the information while Frederick and family were living in Germany, please contact the Bundesarchiv Koblenz, Potsdamerstraße 1, 56075 Koblenz, Germany.
For the information while Frederick and family were living in England, we suggest you contact The National Archives of the United Kingdom, Kew, Richmond, Surrey, TW9 4DU, United Kingdom.
For the information while Frederick and family lived in Sydney, we suggest you contact the National Archives of Australia, P.O. Box 7425, Canberra Business Centre, ACT 2610, Australia. The email address for reference inquiries is firstname.lastname@example.org.
We hope this is helpful. Best of luck with your family research!