I should have given more information when I posted my message.I thought there might be someone out there who had Patrick and Catherine in their family tree. Thank you for all your efforts for our family and I will follow up your suggestions for research.
When Margaret (nee Coleman) was transported to Tasmania she was a widow.She had married Thomas Twohill/Toole/Tool (various spellings) in Limerick and her daughter Mary Anne (aged ca 4-5 years) accompanied her to Tasmania.We think Margaret was born ca 1821 - maybe in Galway. When Margaret married Joseph Hopwood in Dec. 1853 her age was recorded as 30 years giving a birth date of 1823.She died in South Melbourne in 1893 and her age given as 76 years which gives us yet another birth date.We have the history of Margaret and Joseph from the time they arrived in Tasmania but I am keen to know more about Margaret's family of origin in Ireland.
If anyone does have Patrick and Catherine in their family tree we are happy to give them Margaret's history in Australia.