Looking for Bryan Hennessy of Waterford Ireland

Hi. I am reseaching the Hennessy family. Bryan Hennessy was born in 1834 in Waterford. He married Rebecca Phillips in Cork, Ireland in 1853. They had 4 children, Henry, Ann, Robert and William before immigrating to Brisbane, Australia in about 1860. Edward and Walter (my Grandfather) were born after the family arrived. Rebecca died in 1874 and the familt seems to have moved to Sydney. I have traced Ann and Walter but would like info on Bryan, Robert(born 1861, Ireland) and William (born 1859, Ireland) Hennessy.