Walter & Michael McGEE

[augereau]

Hello Rootschatters ! 
I am looking for information re the above McGee family.  Walter & Michael were both tried in Castlebar and found guilty of stealing a few heifers in 1847.  They were sent to Dublin to both Mountjoy and Kilmainham prisons, and were then sent to Tasmania (Van Diemens Land) on the ss Blenheim in 1849.  I have a lot of information from there on -
However, I would very much like to know who their parents were and hence be able to trace a step or two further back ...  Walter was probably born about 1825-26 (or possibly 1820).  I realise that I am probably looking for a needle in a haystack, but any help would be very much appreciated.
Liz