(1862-1934)
Wilburt Trethewy
| +---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 ?
| +---John Trethewey (ABT 1764-JAN 1834)
| | | +---John Rickard
| | | +---Jonas Rickard (ABT 1705-)
| | +---Caroline Rickard (ABT 1734-)
| | +---Honour ?
| +---Benjamin Trethewey (ABT 1802-BEF 1861)
| | +---Charity Strangeman (1756-)
| +---Richard Trethewey (19 NOV 1829-18 APR 1897)
| | | +---Richard Thomas (ABT 1763-)
| | +---Elizabeth Thomas (ABT 1808-)
| | +---Mary ?
+---Naomi Jane (Jennie) Trethewey (18 AUG 1859-1935)
| +---John Warne
+---Naomi Warne (ABT 1834-1912)
+---Mary ?