+--Robert Morrison  (ABT 1700-1764)
+--John Morrison  (1743-18 October 1801)
|  +--Unknown    (Abt. 1700-Bef. 1750)
Robert Morrison  (17 NOV 1773-18 NOV 1845)
|  +--Simon Giffen  (ABT 1711-9 SEP 1774)
+--Elizabeth Giffin  (13 APR 1746-30 OCT 1824)
   +--Jennet Lechman  (ABT 1718-27 DEC 1752)