from  Electronic Scotland Com. The Scottish Nation – Wemyss:

This Sir David Wemyss, the elder son of Sri Michael, had a son, Sir David Wemyss, who was one of the guarantees for the release of David II., and this baron’s son, also named Sir David, was one of the hostages for that monarch’s ransom. The latter left a daughter, Margaret, married to Sir Patrick de Inchmartine, and by him had a daughter, Isabel de Inchmartine, heiress of that barony. This last married Sir Alan Erskine, and had two daughters, his co-heiresses, Margaret, wife of Sir John Glen, and Isabel, married to Sir John Wemyss of Rires and Kincaldrum, the heir male of the family. Besides the lands he held from his father, and those disponed to him by his father-in-law, he had extensive grants of lands in Fife and elsewhere, from Robert II. and Robert III. He had three sons, the second of whom, Duncan, was one of the hostages on the liberation of James I., and the third, Alexander, was ancestor of the family of Wemyss of Lathocar