+--Archibald Clendennin 
      +--William Clendennin 
   +--Robert Clendennin  (1743-30 NOV 1818)
   |  |  +--John Morison  (1628-16 FEB 1736)
   |  +--Hannah Morison  (1716-7 JAN 1802)
   |     +--Jeanette Steele 
+--Robert Clendennin  (12 NOV 1781-20 OCT 1805)
|  +--Elizabeth Humphrey  (1752-11 DEC 1806)
Robert Clendennin  (11 SEP 1804-15 OCT 1874)
+--Susan Dow  (12 MAR 1786-14 FEB 1836)