I am searching for information on the Duffy family

Stephen was the father of James Duffy born around 1849 in Westmeath, Ireland. James married a Mary Ann or Anne tracey/tressy/tracy in 1877 in Westmeath. They sailed on the samuel Plymsoll from Plymouth England to Australia in 1878. They lived in Waverley and Edgecliffe. Ann died 1896 and james died 1912. there were 3 children Delia, William and Mary Ann. On the ship was a Thomas Tracy possible brother to Anna Tracy. if anyone has any more information pls contact me. many thanks in advance.