+--Guillaume DeKey  (ABT 1530-)
               +--Guillaume (Captain) DeKey  (1554-ABT 1624)
            +--Theunis DeKey  (ABT 1590-)
         +--Jacob Theunisse de Kay  (ABT 1633-24 APR 1706)
      +--Jacobus Jacobsen deKay  (1660-)
      |  |  +--Thomas Thomaszen Quick\Cuyck 
      |  +--Hillegonde Theunisse Quick  (25 NOV 1640-15 MAR 1706/07)
      |     +--Belitjen Jacobus Vleckesteyn  (ABT 1604-)
   +--Thomas (Colonel) deKay  (3 FEB 1697/98-1 JAN 1758)
   |  |  +--Thomas (Col.) Willet 
   |  +--Sarah Willet  (1676-)
   |     |  +--Elbert (Capt.) Elbertse Stoothoff  (1620-1688)
   |     +--Helena Stoothoff  (1645-1704)
   |        |  +--Cornelis Lambertsen Cool 
   |        +--Altje Cornells 
   |           +--widow of Garret Wolfertse van Couvenhoven 
+--William Willet DeKay  (20 JUN 1736-20 FEB 1806)
|  |  +--George (Capt.) Duncan 
|  +--Christiana Duncan  (2 FEB 1706/07-)
|     +--Christine (the widow Mitchell of Burmuda)  (-6 SEP 1784)
Enos DeKay  (1770-)
+--Mary Armstrong  (16 JUL 1736-28 SEP 1807)