+--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 
Sarah deKay  (27 DEC 1726-21 JUL 1768)
|  +--George (Capt.) Duncan 
+--Christiana Duncan  (2 FEB 1706/07-)
   +--Christine (the widow Mitchell of Burmuda)  (-6 SEP 1784)