rhayes on Family Tree Circles

My three times ggrandmother is Ellen Mulcahy from Limerick, she married Daniel, alias Denis, McCarthy and arrived in Sydney NSW in 1826 on the Thames with at least 3 children, Jeremiah, Dennis and Ellen. The 1828 census records their ages as Ellen 33, Daniel 32, Jeremiah 12, Dennis 10, Ellen 7 and a newborn, Jane aged 3 weeks. They had a son Daniel Thomas in 1834 at Sydney. He married Margaret McNamara nee Spinks. Their eldest son, my greatgrandfather Daniel Joseph was born 1859 at Bathurst, he married Elizabeth Ward and had 11 children, their 9th child is my grandfather, Daniel Thomas McCarthy born 1898 at Mumbil married Kathleen Corby and had 9 children, my mother is their 3rd child.
I am trying to discover who Daniel and Ellen's parents are, and whether any of their siblings, parents or other relatives came to Australia too. Any help is greatly appreciated and hopefully reciprocated if I have information I can share.