+---Richard Trethewy (ABT 1665-JAN 1741)
+---Richard Trethewy (ABT 1700-ABT 1764)
| +---Ann Martyn 
(ABT 1666-JUN 1738)
+---Richard Trethewy (ABT 1728-21 APR 1818)
| | +---Humphrey Harris
| | +---Gilbert Harris (ABT 1637-)
| | +---Gilbert Harris (ABT 1665-)
| | | | +---Richard Wills
| | | +---Jenifer Wills (ABT 1632-)
| | | +---Christian Best
| +---Jenifer Harris (ABT 1696-1780)
| | +---Thomas Hockin (-ABT 1607)
| | +---John Hockin
| | | +---Elizabeth ?
| | +---John Hockin
| | +---John Hockin (ABT 1616-DEC 1696)
| +---Elizabeth Hockin (ABT 1658-)
| +---Blanche ? (-ABT 1699)
+---William Trethewy (ABT 1768-)
| | +---David Warne
| | +---John Warne (ABT 1656-)
| | | | +---Henry Arthur
| | | | +---Gregory Arthur (ABT 1599-)
| | | +---Honor Arthur (ABT 1632-)
| | +---John Warne (ABT 1700-)
| | | | +---Richard Rounsevall
| | | | +---Gregory Rounsevall (ABT 1617-)
| | | | | +---Jane ?
| | | +---Jane Rounsevall (ABT 1664-)
| | | +---Mary Olver
| +---Mary Warne (ABT 1730-30 MAY 1786)
| | +---Johannes Doketon
| | +---John Doketon (BEF 1459-)
| | +---Thomas Doketon (BEF 1490-)
| | +---Richard Docton (-JAN 1571)
| | | +---Alicia Ash (BEF 1490-)
| | +---Thomas Docton (-AUG 1638)
| | | +---Thomasin Saunder
| | +---John Docton (ABT 1600-JUN 1650)
| | | +---Susanna (Susan) Babacom (-DEC 1634)
| | +---John Docton (ABT 1636-)
| | | | +---John Arundell of Lanherne
| | | | +---Thomas Arundell of Lanherne
| | | | | | +---Gerald Danet
| | | | | +---Elizabeth Danet
| | | | +---Thomas Arundell (-AFT 1620)
| | | | | +---Elizabeth Trengove of Nance
| | | +---Cecilia Arundell (-MAR 1639)
| | | +---Rachell Monp'son
| +---Honor Docton (ABT 1700-)
| | +---Thomas Tregeare
| | +---Henry Tregeare (ABT 1609-)
| +---Mary Tregeare (ABT 1655-)
| +---Mary ?
+---Richard Trethewey (01 MAR 1809-JAN 1893)
| | +---John Harper
| +---Sarah Harper (ABT 1772-)
| +---Elizabeth Cullin
+---Samuel Richard Trethewey (ABT 1848-)
| +---Martha Richards (ABT 1809-1878)
| +---Elizabeth ?
Samuel Trethewey (ABT 1880-)
+---Laura ? (ABT 1855-)