You may find this interesting: (It's a book on the lives of the Mackenzie brothers, especially Alexander. )http://www.archive.org/stream/cihm_03821/cihm_03821_djvu.txt
My g-g-g-grandmother, Amelia Ann MacGregor, was sister of Vere MacGregor, who married Hope Fleming Mackenzie, Alexander's brother. They married in 1847 but she died in 1849, in Canada I guess. She lived in Moulin,Perthshire which, as the book explains, is where the brothers went to school. This book explains that Hope was in Edinburgh in this year before he joined his brother in Canada but sadly does not give any details of the marriage. It also gives charming insight into life in the Perthshire area at that time.