Hi I am married to another of the Sutherland line - coming down from William & Mary Elkin. I think you fell into the same trap of William's father 'John' and Jane Peebles. Their William died in the Orkneys. Our William died in Gravesend December 1863 buried in Gravesend & Milton Cemetery with brother Robert, sister Frances and wife Mary. There is a headstone still standing. Nice to find another family doing the same research.If it is of any use to you I do have a photo of the headstone. Also one of Sarah Webster Tonge (nee Sutherland),(daughter of Robert & Susannah). William sister Frances died without marrying and therefore did not have any children. If you want to get in contact then please do. It would be nice to swop information with another member of the prolific Sutherlands.