(ABT 1517-ABT 1573)
+---Richard Trethewy (BEF 1550-)
+---Anthony Trethewy (-JUN 1625)
| | +---William Hawkins
| +---Joan Hawkins 
(ABT 1530-)
+---Lewis Trethewy (AFT 1619-ABT 1693)
| +---Elizabeth ? (-ABT 1644)
+---John Trethewy
| +---Elizabeth Arundell
+---Robert Trethewy (ABT 1698-AUG 1771)
| +---Elizabeth ? (-JAN 1708)
Elizabeth Trethewy (ABT 1723-)
+---Grace Rogers (-SEP 1772)