Hello Gregor
A person with the same name as your father “Karl Anton Fritz Popp” who died either on the 7th April 1978 or 7th November 1978, site shows two different dates of death may be typing error, is buried at the Freshwater Cemetery, 905 Anglesea Road FRESHWATER CREEK 3216 Victoria, Australia. His parents were Anton & Walburger (Fuchs)
There is more information about your family on the Australian NAA website. Apparently your Father (Karl), Mother? (Herta) Brother? (Thomas) and you came to Australia in December 1954 on the ship? Arosa Star
If you go to this link
http://www.naa.gov.au click on “Record Search” on right of page scroll down page until you come to “Search Now – As Guest) click on that then type in “keywords” box Karl Popp you will get the full details.
Kind regards
Ross