(-BEF 1871)
+---William Mennear (15 JUN 1845-18 OCT 1931)
| +---Elizabeth (Betsy) ? 
(BET 1810 AND 1829-)
Mary E Mennear (ABT 1868-)
| +---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-)
+---Elizabeth Jane Trethewey (20 APR 1849-1914)
| +---Richard Thomas (ABT 1763-)
+---Elizabeth Thomas (ABT 1808-)
+---Mary ?