Thank you so much for your kind comment. Good luck with the research. I don’t do the family tree side of things myself but I know someone who does if you need professional and local assistance.
There is a mention of the “first” Turnbull in my blog piece about Halidon Hill but that’s what you may have stumbled across already. http://berwicktimelines.tumblr.com/post/91789918758/the-battle-of-halidon-hill