Hi, I don't think there was one in Gregor & Isabella's immediate family. Gregor was a soldier who fought in the American Revolution and received a land grant originally in Merigomish, NS. He was the maternal uncle of John Dewar whose wife, Rebecca McDonald, was a sister to Gregor's wife, Isabella Morris McDonald. Gregor and his family moved to Cape Breton in the early 1800's. I believe that one of his sons, Donald who moved to Ontario, had a son named Lauchlin though there may be others as well in the family.