Diane Wetherill 
| +---Frank Waldron
+---Audrey Waldron
| +---James Trethewy
| +---Richard Trethewy (ABT 1665-JAN 1741)
| +---John Trethewey (ABT 1690-)
| | +---Ann Martyn (ABT 1666-JUN 1738)
| +---Joseph Trethewy (ABT 1735-DEC 1816)
| | | +---Phillip Mellow (ABT 1660-JAN 1711)
| | +---Temperance Mellow (ABT 1690-MAY 1765)
| | +---Jane ?
| +---Jonas Trethewey (ABT 1769-)
| | | +---John Rickard
| | | +---Jonas Rickard (ABT 1705-)
| | +---Caroline Rickard (ABT 1734-)
| | +---Honour ?
| +---William Trethewey (ABT 1802-)
| | +---Grace Trenouth (-1808)
| +---Thomas (Tommy) Trethewey (ABT 1828-)
| | | +---James Trethewy
| | | +---Richard Trethewy (ABT 1665-JAN 1741)
| | | +---John Trethewey (ABT 1690-)
| | | | +---Ann Martyn (ABT 1666-JUN 1738)
| | | +---Joseph Trethewy (ABT 1735-DEC 1816)
| | | | | +---Phillip Mellow (ABT 1660-JAN 1711)
| | | | +---Temperance Mellow (ABT 1690-MAY 1765)
| | | | +---Jane ?
| | | +---Thomas Trethewy (ABT 1767-JUN 1827)
| | | | | +---John Rickard
| | | | | +---Jonas Rickard (ABT 1705-)
| | | | +---Caroline Rickard (ABT 1734-)
| | | | +---Honour ?
| | +---Elizabeth (Betsy) Trethewy (ABT 1806-)
| | | +---Sampson Curra
| | +---Ann Curra (ABT 1769-)
| | +---Ann ?
| +---William Henry Trethewey (16 JAN 1862-)
| | +---Elizabeth Parsons (-BEF 1871)
+---Elizabeth (Bessie) Parsons Trethewey (ABT 1885-1918)
| +---John Tucker (ABT 1825-)
+---Elizabeth (Bessie) Tucker (08 FEB 1855-06 SEP 1901)
+---Sarah Ann Jones (ABT 1821-26 FEB 1889)