I am excited to hear from another descendent of William Sinclair with family information. John Matheson's younger sister, Georgina (Georgie or Annie were other names she went by) was my great grandmother. My family was from Westville where William and Mary had their farm and I lived in the house that he built. I have a copy of a print of their farm in Westville that I'll send to you. If you could send me a copy of the picture that you have that would be fantastic. I have quite a bit of information that I can send to you. You could let me know if my information on John Matheson is correct. Looking forward to hearing from you again.
Regards, Marion Doane