
My post is timed at 37 minutes past the hour, and your reply is timed at 44 minutes past the hour.

I included a live link to the NAA website for you to access their site

Here's a further live link :
https://recordsearch.naa.gov.au/Scripts/PassengerSearch.aspIf you enter COX and New Australia (the ship they came on) and 1951 you will see Frank and Alice were the only ones with surname COX on that particular voyage, BUT ....

you will see others with that surname came same year on an earlier voyage of that same ship.
You don't need to fill in every field in that search dialogue box, and sometimes 'less is more'

JM