Hi Kate,
I have been trying to follow your messages but you seem to be lost and bopping about everywhere...lol...Was Thomas a convict or his parents?? Was he NSW or Tas?? Sorry,,but would like to try and help..
Irish Convict Stuff
http://www.pcug.org.au/~ppmay/convicts.htm

http://www.nationalarchives.ie/topics/transportation/search0...

Others

http://svc007.bne009i.server-web.com/catalogue/onlinebook/ga...

http://www.blaxland.com/ozships/page.htm

http://members.iinet.net.au/~perthdps/convicts/index.html
(has alot of links)

http://users.bigpond.net.au/convicts/

http://www.ballaratgenealogy.org.au/convicts.htm
(lot of links)

There are heaps more but most should be included in the ones above.

Kellie