"Farquhar Munro of Aldie, who married Catherine, daughter of William MacCulloch of Badcall, with issue -- I, John, Commissary of Caithness, who married Elizabeth, daughter of William Ross of Logie-Easter, with issue-- (1), Robert, who succeeded him and was also Commissary of Caithness;"
The same paragraph goes on to mention a second son '(2), Robert, who on the 30th of April, 1608, has a sasine as "Robert Munro, son to Farquhar Munro of Aldie".' Although the position of the text suggests he was the second son of John (a second son Robert), he must have been the second son of Farquhar and brother of John. The paragraph continues with a lengthy story about Robert, which eventually calls him "Robert Monroe, Commissar of Catteynes". Taken together with the information on page 559 of this same book, it appears that John was succeeded as Commissary of Caithness by his brother Robert (whether or not John also had a son named Robert).
On page 347, at the conclusion of the story, the author states 'Robert the Commissary died before the 6th of November, 1633, for on that date, John Earl of Sutherland ... grants ... lands ... "belonging to the deceased Robert Munro, Commissary of Caithness." He married, with issue-- ... (3), William, who was born in 1625, and fought at the battle of Worcester, was taken prisoner, and banished by Cromwell, to Boston, Massachusetts, ...'