In 1658 he bought the lands of Allan (now Allangrange) from
Seaforth's trustees, and in 1682 sold it to his uncle, Sir Roderick
Mackenzie of Findon, whose daughter Isobel carried it to Simon
Mackenzie, progenitor of Allangrange.
Alexander died in 1687, and was succeeded by
IV. RODERICK MACKENZIE, fourth of Kilcoy, who married (contract, 7th January, 1689) Annabella, daughter of Sir Donald Bayne of Tulloch, with issue -
1. Donald, his heir and successor.
2. John, who died young.
3. Lilias, who married Donald Dingwall, Provost of Dingwall.
Roderick died in December 1700, and was succeeded by his eldest son,
V. DONALD MACKENZIE, fifth of Kilcoy, who in 1716, married Elizabeth, daughter of John Mackenzie, II. of Highfield, with issue -
1. Roderick, who died young.
2. Colin, who succeeded to Kilcoy.