(-BEF 1851)
Jane Trebilcock 
(ABT 1844-)
| +---Philip Trethewy (-JUL 1733)
| +---Richard Trethewy (ABT 1720-)
| | +---Isabel Beaubery (-FEB 1732)
| +---Robert Trethewy (ABT 1759-)
| | +---Ann Jewell
| +---William Trethewy (ABT 1790-BEF 1851)
| | +---Elizabeth Sarah
+---Jane Trethewy (ABT 1818-)
| +---Nicholas Daddow
+---Grace Daddow (ABT 1795-)
+---Mary Nancarrow