I have Alexander and Margaret living with dau Jennett, wife of Frank Kinman in the 1880 census of Enterprise, Linn County, Missouri.
I believe that there is a son Donald (Daniel in 1870 census) who married Agnes Anderson.
There is a Missouri death certificate for Jannette Kinman, b 28 Jun 1836 d 24 Oct 1912, widowed, father Alexander McKenzie, b Scotland, mother Margaret Frazier, b Nova Scotia. the informant is Mrs. J. B. Fleming, Linneus, Missouri.
Mrs. J. B. Fleming was Margaret Belle McKenzie Fleming, a daughter of Donald/Daniel and Agness (Anderson) McKenzie.