Anne Marie! Thank you so much for all your sleuthing. Here's what I've found so far.
Alexander Scott B. 1 Feb 1831, Baptized 3 Feb 1831, Kilmonivaig, Inverness-shire. Parents John Scott and Isabella McDonell
1841 census address Glendomor. Dads occupation as sheperd. 6 children listed.
1851 Alex Scott is visitor in Borlum. Occupation Sheperd
1861 Address Letterfern. Living with his parents. Occupation Shepherd
1871 Address Letterfern. Living with mother only. Occupation Shepherd
1881 Address Letterfern. No parents. Occupation Sheperd
I found Alexander Scott's death cert on SP. He died 10 Sept 1899 in Cullochy, Fort Augustus.
His occupation was farmer. He is listed as single. His mother's maiden name was McDonell and his dad John was a Shepherd. Hugh MacDonald, nephew on the maternal side was the informant.
I am hoping that this is the correct Alexander Scott. He is the only one who fits the occupation/age in the Inverness-shire area,but, unless I can link him to his daughter Christina Scott
thanks again for the help and suggestions. Sheila
BTW, I found a marriage record for an Alexander Cameron to a Christy MacMillan 18 Jan 1810 in Aharacle, Argyll. This might be the marriage before Margaret and the reason for Christina Scotts name.