(AUG 1964-)
Trevor George McGerrigle (16 DEC 1989-)
| +---Thomas Houston
| +---John Houston
| +---Thomas Huston
| | +---Mary Wilson 
| +---Robert Wilson Huston (21 NOV 1878-25 AUG 1952)
| | +---Anne McCrea
| +---Samuel (Sam) Wilson Huston (13 MAR 1929-)
| | | +---Samuel King (ABT 1804-22 APR 1884)
| | | +---Samuel King (27 MAR 1842-31 JUL 1916)
| | | | +---Mary Gordon (ABT 1802-09 JAN 1875)
| | +---Mary Elizabeth King (28 FEB 1897-22 DEC 1980)
| | | +---John Sproule
| | +---Mary Jane Sproule (1853-01 APR 1921)
+---Doreen Mary Huston (31 DEC 1965-)
+---Mary Isobel Woodburn Wilson (01 MAR 1935-)