Ronald MacKinnon was the stepfather to one of my ancestors, Eleanor Baxter who married Mark Last Cohen. I know that much is true, I have a transcript of the marriage certificate and the family notice in the herald supports it. Looked further into the background, but I have mucked it all up, by the looks of things. Eleanor Baxter's first marriage and younger one's father appeared to be straight forward.
William Baxter was thought to have died, hence the second marriage. But since then I have discovered Eleanor died 7 years before the marriage of younger Eleanor to Mark Cohen. So I have no real idea if I am on the right track.