Yvonne
Thanks for the reply. My family history leads to the Fergusons, and the connection with the Douglas family is, to say the least, distant - Janet Whyte's father Duncan was brother of Alexander Whyte 1776-1867 and Alexander's daughter, Mary Whyte 1806-1881 was married to Duncan Ferguson 1802-1870 and that's it although I have most of the info on the Whyte dynasty.
I see you have Neil Douglas's occupation as ferryman. If that was the case he was almost certainly working for the Fergusons who operated the ferries between Strone, Kilmun and Hunters Quay. My record has Neil as Posmaster at Kilmun Post Office in 1841 - also owned by the Fergusons.
What I don't have on the Whyte/Douglas connection is when Neil died and what became of daughter Janet. Perhaps you could fill in the blanks. Let me know if there's anyone else you'd like me to look up in the Kilmun Monumental Inscriptions book.
Best wishes
Alan