+--Joseph P. Stevenson  (19 MAY 1792-21 MAY 1858)
+--Samuel T. Stevenson  (11 OCT 1821-)
|  |     +--Benjamin Thom  (1747-12 JUN 1811)
|  |  +--Samuel Thom  (29 AUG 1775-22 NOV 1865)
|  |  |  |        +--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)
|  +--Eliza Thom  (2 JUN 1802-22 OCT 1842)
|     |  +--William Dinsmoor 
|     +--Elizabeth Dinsmoor  (DEC 1778-17 JAN 1868)
Samuel E. M. Stevenson  (28 APR 1848-)
+--Therese Guthrie  (14 DEC 1822-)