+--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)
+--William Thompson Morrison  (26 FEB 1804-27 November 1887)
|  |        +--William Thompson  (-1718)
|  |     +--Samuel Thompson  (1691-23 Mar 1782)
|  |     |  +--Marie Margaret Thompson  (1665-20 January 1752)
|  |  +--James Thompson  (1724-6/20/1790)
|  |  |  +--Elizabeth McKinney  (1686-10/22/1776)
|  +--Elizabeth Thompson  (20 MAY 1778-21 APR 1862)
|     +--Elizabeth McKnight  (1739-3/18/1825)
Emily Morrison  (abt 1852-)
+--Tamar Thompson  (22 December 1809-29 October 1889)