+--William H. Cook  (28 OCT 1852-)
   +--Allison Joseph Cook  (29 NOV 1891-21 JUL 1972)
   |  +--Mary Ann Mason  (3 MAY 1859-)
+--Douglas Allison Cook  (19 SEP 1920-28 JAN 1999)
|  |              +--Hans Jerg Wehrli 
|  |           +--Peter Werley  (1753-)
|  |           |  +-- Barbara 
|  |        +--Peter Werley  (ABT 1789-1871)
|  |        |  +--Maria Smith 
|  |     +--James Wereley  (1826-1892)
|  |     |  |                 +--Georg Helmer  (1590-)
|  |     |  |              +--Leonard Helmer  (ABT 1617-24 SEP 1691)
|  |     |  |           +--Hans Philip Helmer  (20 MAR 1658/59-BEF 1741)
|  |     |  |           |  |  +--Andres Rippel 
|  |     |  |           |  +--Apollonia Maria Rippel  (ABT 1623-)
|  |     |  |        +--Leonard Sr. Helmer  (5 FEB 1689/90-)
|  |     |  |        |  |  +--Johann Wilhelm Mockler 
|  |     |  |        |  +--Elizabeth Mockler  (1663-)
|  |     |  |     +--Leonard Jr. Helmer  (ABT 1720-)
|  |     |  |     |  +--Elizabeth Ruhl  (1694-BEF 1781)
|  |     |  |  +--John P. Helmer  (17 MAY 1751-1848)
|  |     |  |  |  |  +--Christian Nellis 
|  |     |  |  |  +--Catherine Nellis  (18 JAN 1723/24-1805)
|  |     |  |  |     +--Barvalis Klock 
|  |     |  +--Margaret Helmer  (ABT 1787-UNKNOWN)
|  |     |     +--Anna "Nancy" Milross  (1767-28 AUG 1831)
|  |  +--Alonzo Benjamin Wereley  (8 JUN 1853-1 FEB 1938)
|  |  |  |  +--Robert Dixon 
|  |  |  +--Sarah Ann Dickson  (ABT 1835-1871)
|  +--Agnes Diane Wereley  (26 APR 1894-7 DEC 1927)
|     |  +--Nicholas Shaver  (12 SEP 1814-)
|     +--Etta Catherine Shaver  (12 OCT 1853-13 NOV 1938)
|        |  +--Gilbert Morgan 
|        +--Eliza Ann Morgan  (15 OCT 1853-)
|           +--Mrs. Gilbert Morgan 
Robert D. Cook  (18 MAY 1951-10 MAY 1991)
+--Muriel Froats  (11 AUG 1924-19 SEP 1997)