Just seen this post. Dugald MacInnes and his wife Kate Johnston were my great great great grandparents. I am descended from their son Donald MacInnes and his wife Catherine MacColl. I have a HUGE amount on the family. They were Episcopalians so very few records of the family appear in the OPR. The family did originate in Callart before crossing Loch Leven to Carnoch and Tigh Phuirst in the mid 1820's. Kate Johnston was from the abandoned settlement of Tollie in Glen Nevis.
Dugald did indeed have a brother Hugh(Ewen) from whom the late Bishop Duncan MacInnes (Episcopal Bishop of Moray was descended), a brother Duncan, a brother Angus and a sister Mary that I know about. Many many descendants scattered across the world of John MacInnes and Kate Rankin.