+--William MCMAHAN  (1690-21 AUG 1750)
      +--Richard MCMAHAN  (1723-AFT 1794)
      |  +--Elizabeth BLAIR  (ABT 1690-AFT 1749)
   +--William MCMAHAN  (9 JAN 1748-30 JUN 1794)
   |  +--Nancy Agnes LILBURN  (ABT 1725-)
+--William Friend MCMAHAN  (25 OCT 1776-1 NOV 1862)
|  +--Ann COX 
Isaac MCMAHAN  (1804-)
+--Margaret "Peggy" COX  (ABT 1777-28 AUG 1858)