John Hartnett & Frances (Fanny) Legg-Clonmel

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I am looking for any information regarding a John Hartnett, who married Frances (Fanny) Legg in Clonmel, Tipperary.  Two of their sons, Richard (24) and William (19) sailed to Melbourne, Australia, in 1841, on the ship Columbine.  John followed four years later in 1845, when he was 18 years old, on the ship Herald. Their parents had both died before Richard and William sailed to Australia in 1841.
John Hartnett (junior) married Jane Lamey, (born in 1836) on 22 March 1856 in Moree, NSW, Australia and they had (I think) 14 children born at Warialda, NSW between 1858 and 1879.
I am interested to learn any family history details, in particular, about John Hartnett (senior) & Frances (Fanny) Legg, and their parents.
Do any of these names have a connection with your Hartnett family tree?