Sir Robert Logan
Thomas Isaac married Maud (Matilda) Bruce, daughter of Robert, the Bruce, King of Scotland and Elizabeth de Burgh, after June 1342. They had two daughters, Janet & Katherine. He was of Formatine and Kintore, Aberdeenshire. .” At an unknown date, his wife, Maud, was granted half of the thanage of Formartine and Kintore, Aberdeenshire by her brother, David II, King of Scots.