Wiggy,
Catherine was sentenced 1806 Old Bailey as Catherine McNally, arrived Sydney Cove 1807,married Bryan Overhand Capt of Lady Nelson1810 in Sydney, moved to Hobart in 1814 with Thomas Ransom boat builder Norfolk Island, gave birth to Thomas Mc Nally 1820, married Frederick Lewis Stieglitz in 1829,became chatelaine of Killymoon, died in 1857 and buried next to the hawthorn hedge on east side of Cullenswood Church near St Marys, Fingal Valley. Thomas McNally adopted the name Ransom. At one stage I thought his father could have been Matthew Brady the bushranger as Brady was assigned to Thomas and Catherine on his arrival in Hobart 1820, but dates don't quite fit. Unlikely to have been old Thomas. Might have been Overhqnd who could have turned up again for a short time. She was highly regarded by Governors and bushrangers alike, and does not seem the flighty type, so his father is still an unknown. I have been researching her for 20 years. I live 2km down the road from her grave, so happy to answer any questions that I can.
Regards, David Clement