JeansGirl on Family Tree Circles

My great grandfather was a Deane and arrived into New Zealand via Cape Town, from Liverpool, England.

He had two older brothers that arrived into Auckland (Patrick with a Margaret Deane - possible wife), New Zealand and bought land. In 1870, one of the brothers (Patrick) sells the land and the family story is that both brothers go to Coolgardie in search of gold.

Brother's names:
Patrick Deane (could be Ross Patrick), born before 1841 in Ireland, https://www.wikitree.com/wiki/Deane-1321
Antony Deane (could be Anthony) born, born before 1844 in Ireland, https://www.wikitree.com/wiki/Deane-1078

I am trying to see if they came to Western Australia and if so what happened to them. Did they have children? Where did they settle? When did they pass away?

Any help in advising me on how to go about researching them in Australia would be appreciated.