Hi Kerry (kctoo),
I am also a descendant of the Thomas Davy line through Sarah Ann Hueston (nee Chesterman), who was Davy's great-grandaughter.
I'm afraid I'm guilty of conflating Thomas Davy the lighterman and Thomas Davy the convict. Apart from the handwriting evidence, which is compelling, can you point me to other records which distinguish the two?
My father has a photograph of Hannah Ann Chesterman (nee Clements b 1827, grandaughter of Davy and Elizabeth (nee Pile)), Sarah Ann Hueston (nee Chesterman b 1850) and an infant, whom I'm told is my great-grandfather, Arthur Edward Hueston (b. 1893). I'd suggest it's a Christening photo. Very happy to share with you if it is of interest, noting that I'm not sure where we both sit in the tree.
PS. I am new to family research and consequently unsure of protocols regarding the sharing of information. If this post shows I've gone about it the wrong way, then I am happy to be corrected and educated.
Kind regards,
David H
Gold Coast, Queensland