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Not what you are really asking for but a few little things anyway:

For those of us who don’t know Malta, you might want to correct your “Aldollarata” to “Addolorata - Cemetery in Paola, Malta”

I noticed that a Nicholas Ambrose Joseph BRINCAT has the same parents listed (Vincent and Carmela) when he dies in NSW in 1988.

I assume that your Leone BRINCAT and daughter arrive in Sydney, NSW on 1 Mar 1956
Leone’s birth date is listed as 10-3-1897 (https://recordsearch.naa.gov.au/scripts/AutoSearch.asp?O=ID&Number=203687051)
Arrival in Sydney: https://recordsearch.naa.gov.au/scripts/AutoSearch.asp?O=ID&Number=32825715&i=589
(Note: Having Leone’s DOB might help to acquire his BC …)

Do you have any clues re the parents at all?
In case Giorgio had siblings,

At least 2 of his siblings ended up in Victoria as well:
Tullio b 1906, d 1976  and Lorenzo b abt 1895, d 1958

Are you able to search/read Italian records or do you need help ...?

Based on their Immigration Cards:

It seems that Jonas Sadauskas (b 1 Feb 1927) and his probable mum Ona Sadauskiene (b 12 Jan 1908, daughter of "Antonio" (Antanas?) Puras and Magdalena) arrived on 29 Oct 1929 in Santos.
(Ona is married, but I haven’t been able to locate her hubbie yet.)

This post is already becoming rather confusing. Unfortunately the OP has too many names listed within the one post, a lot of generic wants, but barely any background information. I have therefor no idea what you already know or don’t know.  However, here is an attempt for one person:


Patricia Cynthia Jane Helen Theresa HICKEY b 3 Nov 1922 Durban Natal, died 27 Aug 2005 Worcester (Western Cape?)
NB: In 1942, father dead, mother still alive
2005 probate file: https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSLX-3Q8F-K?i=1
2005 grave: https://www.findagrave.com/memorial/187956537/patricia-bird
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First husband John Fynney Stranack 26 April 1917 Durban, Natal – 9 August 1956
Marriage: 4 Oct 1942  - https://www.familysearch.org/ark:/61903/3:1:S3HT-DT1Q-PZP?i=2543  (witness: D Hickey!!!)
Divorce: abt 1952
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Second husband: ERIC LLEWELLYN GREGG.
Divorce abt 1956
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Third husband: Kenneth Charles BIRD
Marriage: 1963: https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSLX-3QDW-9?i=3


I suspect that Patricia could be the daughter of Charles John Hickey (b abt 1864, possibly died between 1921 and 1942) and Daisy Gardner (b abt 1893, died 1958)
Their 1921 marriage: https://www.familysearch.org/ark:/61903/3:1:S3HY-68J7-DR2?i=1443
Daisy’s 1958 death: https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91P-K2RB?i=35
Unfortunately the stuff needed to prove this either way is not online yet: e.g. Patricia’s 1922 BC, Daisy’s 1958 (#558/1958) Natal probate file …