Trying to find the impossible. John Archibald Evans b north Wales round 1824. Came to Sydney Aus....J A Evans is registered in the as a Mattrass Maker at Princes St North.[Commercial Directory - Ford Sydney Sydney for 1851 e919.4441002 NSW State Library]

John A had two brothers Henry & William - William came as cheesemakers to Kameruka. Two Children born before marriage to Myra - Henry plus one other. One died after falling off horse. John A died young (3 children) and Myra re married J Grant and had 8 more kids.
Found what appears to be 3 brothers coming into Australia 1853 on David McIver-Henry Evans age 22, Thomas age 23 and William age 24.
If they are his brothers they would have arrived about the time he died in Sydney.