+--Robert Morrison 
   +--William Morrison  (30 NOV 1726-28 FEB 1778)
   |  +-- Elizabeth 
+--David Morrison  (14 OCT 1756-5 JAN 1826)
|  +--Jane Rogers  (-AFT 1794)
John-Bush Morrison  (8 FEB 1793-6 JAN 1855)
+--Margaret McGrath  (5 JUL 1766-30 AUG 1843)