Thomas Fitzpatrick and Rose Garvey 1830s

I am looking for BMDs for Thomas Fitzpatrick and his wife Rose Garvey who had children baptised in Clonallon RC church near Newry, Thomas jnr, bapt 21 Nov 1828 and Patrick bapt 24 Feb 1832.  I have reason to believe that there were other brothers named William, James and Michael but have yet to find church or civil records to prove that.  Also think father Thomas owned or tenanted a farm at Ballyholland Lower townland. Thomas jnr came to Victoria, Australia in the early 1850s and raised a family in southern NSW. Descendents of his family still live there. Has anybody got links to this family or knows anything about what happened to them in Ireland or elsewhere?  Did they also migrate?

Any advise is most welcome,

Ric