1 John de Crichton, Lord of Crichton Born: Abt. 1278 Died: Bef. 1357

..... 2 William Crichton,  Lord of Crichton Born: Abt. 1304 in Crichton, Edinburgh, Scotland Died: Bef. 1393 + Isabella Ross, Heiress of Sanquhar, Dumfriesshire, Scotland Born: in of Ryehill

............ 3 John Crichton [NOTES] Born: Abt. 1330 Died: Bef. 1424 in Crichton, Pathhead, Midlothian + Christian Gremislaw Born: Abt. 1356 Died: Abt. 1429

................... 4 William Crichton, Lord of Crichton [NOTES] Born: Abt. 1383 in Crichton, Pathhead, Midlothian Died: Abt. 1455 in Crichton, Pathhead, Midlothian + Agnes Married: Abt. 1407

.......................... 5 Elizabeth Crichton Born: Abt. 1410 Died: 09 June 1479 in Strathbogie, Aberdeenshire, Scotland + Alexander Seton Gordon Born: Bef. 1435

.......................... 5 James Crichton
.............................. +Janet Dunbar

............ 3 Edward Crichton Born: Abt. 1322 in Sanquhar, Dumfriesshire, Scotland

Source:
G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume I, page 156. 

NOTE: Some dates are estimates.

NOTE: Some information from another researcher. Not yet verified by me.