Evelyn, thank you so much for your reply. I'm quite curious about the Sandfield MacDonald family. Is there something I can read on-line about them?
I'm afraid I have nothing further to contribute other than what I have written above. I will, however, take your suggestion and visit the Glengarry County Genweb site to see if I can find any information on Miles Campbell b 1817, Lancaster (son of John Campbell and Mary McGillivray) and, his wife, Isabella Dewar b abt 1815, Glengarry.