It is very likely that Catherine was a convict, like her husband, there were at least two of that name who came out to Tasmania in the early 1840's. Most likely it would be Catherine Ryan, Irish, arrived 1842 on the Hope. She'd been convicted of stealing a chemise and Transported for 7 years. She received a conditional pardon 23 Nov 1847 and a Ticket of Freedom on 6 November 1848. This would fit fairly neatly with children's births and the timing of their departure from Tasmania.
Catherine married George Carns. (George Carns was born circa 1802 in England.)
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