(1702-1759)
+---Nicholas Richards (ABT 1734-1814)
| | +---Amos Bennett
| +---Mary Bennett 
(ABT 1706-)
| +---Pascas Richard
Elizabeth Richards (1774-)
| +---James Trethewy (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)
+---Ann Trethewy (ABT 1737-1798)
+---Grace Rogers (-SEP 1772)