+---William Harry (1771-JUL 1835)
| +---Elizabeth Benallack 
Nicholas Harry (ABT 1800-)
| +---Philip Trethewy (-JUL 1733)
| +---Richard Trethewy (ABT 1720-)
| | +---Isabel Beaubery (-FEB 1732)
+---Isabel Trethewy (ABT 1774-JUL 1862)
+---Ann Jewell