You've been busy, Rosie! I gave up after my last post as I was starting to go cross-eyed. If Gladys married a Hamilton, who on earth is G.M. MacKenzie then? The only other niece I know of at this point, apart from my great-grandfather's daughters, is William's sister Isabella's daughter, Atholl Isobel Murray, the doctor's wife. I wonder if this is one of the missing brother Rankine's children?