John, second surviving son of John MacMillan of Holm etc., who died in 1852, succeeded to, and was later styled of, Brockloch. Whether he owned all or only one-third cannot be determined now, but most likely it was the latter. The whole farm now forms a part of Craigengillan estate, having been sold by John MacMillan to Col. the Hon. Augustus Murray Cathcart in 1831. And so Brockloch became the property of others after being the chief seat of the Galloway MacMillans for centuries.