+--Benjamin Thom  (1747-12 JUN 1811)
Isaac Thom  (31 JAN 1780-29 JAN 1832)
|        +--John Morison  (1628-16 FEB 1736)
|     +--James Morison  (1675-15 MAR 1756)
|     |  +--Wife One 
|  +--Samuel Morison  (1704-11 FEB 1776)
|  |  +--Mary Wallace 
+--Catherine Morison  (20 SEP 1745-5 MAY 1815)
   |  +--Samuel Alison 
   +--Martha Alison  (31 MAR 1720-3 DEC 1761)