+--William A. Trefethen  (14 OCT 1846-)
Edward A. Trefethen  (26 DEC 1872-)
|                 +--John Morison  (1628-16 FEB 1736)
|              +--Halbert Morison  (1685-6 JUN 1755)
|              |  +--Wife One 
|           +--David Morison  (1730-23 FEB 1825)
|           |  +--Jean Steele  (1700-19 OCT 1753)
|        +--Samuel Morrison  (21 SEP 1766-20 JUN 1843)
|        |  |  +--Thomas Boyes 
|        |  +--Elizabeth Boyes  (1739-1 DEC 1816)
|     +--John Morrison  (14 JUN 1792-5 JUN 1866)
|     |  +--Isabel Spear 
|  +--Peter Jenkins Morrison  (28 FEB 1823-8 OCT 1864)
|  |  +--Hannah Perkins Hunt  (1 JAN 1797-31 MAR 1860)
+--Lelia M. Morrison  (29 JUL 1850-)
   +--Hannah Hollis  (12 NOV 1816-2 MAY 1874)