(ABT 1517-ABT 1573)
+---Thomas Trethewy (-ABT 1616)
+---Bartholomew Trethewy
+---Bartholomew Trethewy (-1666)
+---Thomas Trethewey (-ABT 1692)
+---Bartholomew Trethewy (ABT 1667-MAY 1755)
Thomas Trethewy (ABT 1697-)
| +---Robert Trethewey (-JUL 1676)
| +---Walter Trethewey (-1710)
+---Elizabeth Trethewey 
(ABT 1670-AUG 1743)
+---Mary Brewer