I have just come across this thread, and it appears to connect with some research I have been doing on a family in the Flinders Ranges (my area of historical research). Their great grandmother was a Nellie Lamb Conway, and the name Lamb has been a bit of a puzzle. I have found that Nellie was the daughter of John Nixon Conway and Beatrice Tortoise. John Nixon Conway was the son of William Thomas Conway and Cora Matilda Lamb.
Cora Matilda Lamb was the daughter of William Bailey Lamb and Mary Ann. She is listed as their child on the passenger list of the Marquis of Anglesea. She married William Thomas Conway in 1846 at Fremantle; their son John Nixon Conway was born in 1847, and William Thomas Conway died that same year. She remarried in 1854 to Edward Newman. She is listed as the wife of Edward Newman in the 1867 advertisement re the estate of Elizabeth Matilda Corbin of Clapham, Surrey (although I think Cora had died by then?).
My sources have been the SA BDM CDs, the SA Biographical Index, the WA Online BDMs and backup material from the NLA's Trove online newspaper site.
There's a large amount of Trove newspaper material on the various parts of this family, which you have probably come across - Corbin Lamb in SA, Edmund Lamb in Sydney, William Lamb in Fremantle, John Nixon Conway in Port Augusta SA. And of course Edward Newman. There was also Cora Lamb, daughter of Corbin, who featured in a number of quite informative newspaper articles in South Australia over the years.
How does this fit in with your collective knowledge of William Bailey Lamb's family and descendants? I can provide my source information where needed.
Frank
in Adelaide South Australia