Hi Leisa I got the info from the book I mentioned. It is not my research but the contributor/researcher for that info is listed at the back of the book. Surname McAuliff which is Thomas's daughter Agnes's married name. WA address.
It has Thomas born Ennistymon Clare Ireland c1836 arriving "Charlotte Jane" 14.1.1852.Sorry, it appears this John who married Elizabeth Curnow is a brother to Thomas born c1830 same place died 23.12.1900 Ninnes , SA. Their father is listed as John.
From 1908 a column for birthplace is on death certificates but I wouldn't guarantee it was filled in.I see he died at Wilmington. If you are near Pt Augusta I suggest you look at the certificate at the Public Library before purchasing it just in case.If not you could email them and they may look it up for you. They have done this for me in the past for free.