Why would you say that Sarah McLeod remarried Edward Smith? My mother was raised in the area where John and Sarah McLeod lived. My mother well remembers the children of a brother to Joseph Obleman going to Church at St Columba Presbyterian Church at Kirkhill, Lochiel Twp, Glengarry County.
I believe that Edward Smith and wife Eliza are Aunt and Uncle to John Smith and Sarah Smith. John and Saran Smith were with their aunt and uncle in the 1871 census leaving us to know that their parents had died before the 1871 census. Anne Neuman