Hi Ding,
Yes a really great family. Sounds like you have heaps. I too have heard of the rescue by her brother Captain Thomas Johns, in his ship the Liberty, of Jane Johns/Trinidad 1799-1872 and the story of a dark skinned son being born soon afterwards (he cannot be substantiated in the Parish Records)
I am very concerned about William son of John and Gertrude = Mary Hiscutt. Ohhohh goodness and this is your line. This is not how I see it

I have Mary Jane (looks like I haven't followed her to marriage - Last I have listed is 1861 (baptism 19 Mar 1839 Crantock father gentleman of Tregunel) daughter of Silas Hiscutt and Harriet Johns as you mention and he the son of William and Mary (don't have than marriage, so did not know Mary's maiden name) Now sorry to say here is where we become horribly unstuck, cas I don't believe he is John and Gertrude's Son.

William the son of John and Gertrude = Elizabeth Darke He was from Trevethick and is immortalised in Martyn Window

I did a bio on him for the Church
Here is a Photo of the Martyn Graves at St Columb Minor
John and Gertrude on the left, William and Elizabeth on the right and Williams brother John behind him.
Kris
