Dear bbeattie, Mary Carnegie daughter of William Carnegie, Farmer and Christian Macher died at St James Place, Brechin on 21 Feb 1869 aged 90 years. She was married to James Don, Master Blacksmith. Their son James was the witness on the Official Death Certificate. There are lots of Mary Carnegies in the records so it is VERY easy to get them mixed up and tied into the above Alexander line.
Happy hunting for the real Mary Carnegie that goes with this Alexander Family Tree. What makes you think that John Alexander her husband died 1841 as we know very little about the both of them other than a Marykirk marriage 1798. nw_whiskers