+---Richard Trethewy
(ABT 1665-JAN 1741)
+---William Trethewy
(ABT 1694-)
| +---Ann Martyn
(ABT 1666-JUN 1738)
+---James Trethewy
(ABT 1719-)
| +---Jenefer Sweet
(-SEP 1733)
+---William Trethewy
(ABT 1753-)
| +---Grace Warne
+---John Trethewy
(25 DEC 1805-1871)
| +---Catherine Scholier
+---Alexander Thomas Trethewy
(16 AUG 1842-09 AUG 1901)
| +---Margaret Grinton
(24 APR 1810-1860)
+---Harry Ira Trethewy
(27 SEP 1878-1932)
| | +---James Trethewy
| | +---Richard Trethewy
(ABT 1665-JAN 1741)
| | +---William Trethewy
(ABT 1694-)
| | | +---Ann Martyn
(ABT 1666-JUN 1738)
| | +---James Trethewy
(ABT 1719-)
| | | +---Jenefer Sweet
(-SEP 1733)
| | +---William Trethewy
(ABT 1753-)
| | | +---Grace Warne
| | +---Richard Trethewy
(02 FEB 1799-24 DEC 1875)
| | | +---Catherine Scholier
| | +---John Trethewy
(25 JUL 1823-24 SEP 1876)
| | | +---Catherine Hooper
(25 MAR 1796-06 DEC 1893)
| +---Anna Maria Trethewy
(-20 SEP 1900)
| +---Ellen Chesley
Leslie Horton Trethewy
(22 DEC 1908-27 DEC 1975)
+---Bessie Jane May Horton
(19 OCT 1887-27 JAN 1968)