You may already have some of this information, but just in case:

Death registration #26 for 1870 in Kirriemuir
Jessie Farquhar McKenzie
Died - 26 Janyuary 1870, High St., Kirriemuir
Age - 3 years
Father - Alexander McKenzie, flesher
Mother - Catharine Hay MNcKenzie MS Fairweather
Informant - father

And this would be Catherine Hay Fairweather's father:
Death reg. #33 for 1875, Kirriemuir
Robert Fairweather, crofter, married to Janet Stewart
Died - 21 April 1875, Westmuir, Kirriemuir
Age - 77
Father - Robert Fairweather, crofter, deceased
Mother - Betty Fairweather MS McIntosh, deceased
Informant - Alexander McKenzie, son in law, High St.

A brother of the above Robert, who would be an uncle to Catherine Hay Fairweather:
Death reg. #25 for 1873, Kirriemuir
Charles Fairweather, farm servant,m married to Elizabeth Lindsay
Died - 21 February 1873, Balmuckety Fens, Kirriemuir (where my relatives were living)
Age - 68
Father - Robert Fairweather, farm servant, deceased
Mother - Betsy Fairweather MS McIntosh
Cause - diseased heart, 3 days, diarrhoea 48 hrs
Informant - John Fairweather, sonm, 33 Park Wynd, Dundee

Irene, in Michigan