Uncle on Family Tree Circles

My mother was Lucy Jean Hildrew of Yetman NSW. I have all of her sibling names. I have been told that John & Rose came from Ireland and I do not know anything further other than Roses mothers name was Elizabeth Little and Johns fathers name was John.

John and Rose lived, it seems, at Callandoon Station at Goondiwindi and are buried there in unmarked graves. I would like to know if this is correct.

My mother and her parents are buried in the Yetman cemetery