If you haven't already done so, please see:
Memorials of St. Michael's: The Old Parish Churchyard of Dumfries, by William McDowall (1876), pp. 198-99:
In 1827-8-9 the Burgh was ruled over by Provost WILLIAM MCKIE, whose name we read on an adjoining monument. He was an extensive manufacturer and commission agent, prosecuting a prosperous business for many years, and being, says the [Dumfries] Courier "remarkable during his whole career for punctuality, perseverance, and untiring industry. On retiring from trade, he devoted much of his time to the charities of the town, "and evinced in other respects" great anxiety to alleviate distress, combined with an ardent zeal for the promotion of every judicious public improvement" Mr. McKie made an excellent chief-magistrate, discharging his official duties creditably to himself and so as to render his "reign" popular with the community. He died 30th May 1838, aged 66.
The monument commemorates also JAMES, his second son, bank-agent and solicitor, whose useful life was cut short on the 4th of February 1874. To the son, not less than to the father, the highest burghal rank would have been assigned by the inhabitants, through the Council, but Mr. JAMES MCKIE James repeatedly declined the proferred honour, content to use his talents and exercise his influence as a municipal commoner for the public weal. He took a great interest also in County affairs, and as a devoted member of the local Liberal party, he occupied a vanguard position on their side during the protracted struggle for the representation of Dumfriesshire in 1868-9. "As a man of business '' — we quote again from the Courier — " Mr. M'Kie was much respected and trusted: in every transaction of life he was both just and sensitively honourable, and his sagacity, acquaintance with affairs, and never-failing desire to oblige where help was deserved, rendered him a safe counsellor and a valued friend." Mr. M'Kie died when he had reached the age of 53, at his beautiful mansion, MOAT HOUSE, where his venerable mother, the sister of JAMES BROOM, resides with her daughter, and son, WILLIAM, who was formerly a manufacturer at Hawick.
THOMAS MCKIE, the well-known advocate, is another member of the family.
NOTE: The above-referenced "Moat House" is Moat Brae in Dumfries, in which the Peter Pan Moat Brae Trust is currently housed. Seehttps://www.peterpanmoatbrae.org/ My interest in this particular McKie family relates to the above-referenced James Broom (1795-1842), who was a prominent social reformer in Dumfries. Brooms Road in Dumfries is named in his honor.