+---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)
+---Thomas Trethewey (ABT 1759-11 JUN 1846)
| | +---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 ?
+---Samuel Trethewey (ABT 1793-14 MAR 1875)
| | +---James Trethewy (ABT 1517-ABT 1573)
| | +---Thomas Trethewy (-ABT 1616)
| | +---Bartholomew Trethewy
| | +---Bartholomew Trethewy (-1666)
| | +---Thomas Trethewey (-ABT 1692)
| | +---Bartholomew Trethewy (ABT 1667-MAY 1755)
| | +---Walter Trethewy (ABT 1702-NOV 1751)
| | | | +---Robert Trethewey (-JUL 1676)
| | | | +---Walter Trethewey (-1710)
| | | +---Elizabeth Trethewey (ABT 1670-AUG 1743)
| | | +---Mary Brewer
| | +---Humphrey Betty Trethewey (ABT 1731-JUL 1769)
| | | +---Joan Woon (-1735)
| +---Jane Trethewey (01 OCT 1764-05 JUL 1846)
| | +---Richard Hendra
| +---Blanche Hendra (ABT 1734-JAN 1775)
| +---Jane Murton
+---Richard Trethewey (ABT 1830-)
| +---Maria Snell (-NOV 1837)
+---Michael Trethewey (23 AUG 1859-09 MAY 1927)
| | +---Gregorie Liddicoat (ABT 1557-1620)
| | +---Thomas Liddicoat (ABT 1585-JAN 1668)
| | | +---Anne Carpenter
| | +---Richard Liddicoat (ABT 1612-JUL 1655)
| | | +---Grace Gradely (ABT 1589-MAY 1649)
| | +---Robert Gregor Liddicoat (ABT 1649-1723)
| | | +---Jane May (ABT 1616-)
| | +---Thomas Liddicoat (ABT 1679-1757)
| | | +---Grace Cundey (ABT 1654-1715)
| | +---Charles Liddicoat (ABT 1709-)
| | | +---Candace Tom (ABT 1684-)
| | +---William Liddicoat (10 JUN 1729-)
| | | +---Margaret Frances Edwards (ABT 1713-)
| | +---William Liddicoat (ABT 1758-)
| | | +---Mary Treweeke
| | +---Silas Liddicoat (ABT 1798-)
| | | | +---James Trethewy (ABT 1517-ABT 1573)
| | | | +---Thomas Trethewy (-ABT 1616)
| | | | +---Bartholomew Trethewy
| | | | +---Bartholomew Trethewy (-1666)
| | | | +---Bartholomew Trethewy
| | | | +---Thomas Trethewy (ABT 1675-MAY 1743)
| | | | | +---Jane Bruart
| | | | +---Thomas Trethewy (ABT 1710-FEB 1795)
| | | | | | +---Phillip Mellow (ABT 1660-JAN 1711)
| | | | | +---Joan Mellow (ABT 1680-)
| | | | | +---Jane ?
| | | | +---Thomas Trethewy (ABT 1735-SEP 1814)
| | | | | | +---Richard Jolliffe
| | | | | | +---Robert Jolliffe
| | | | | | +---Robert Jolliffe (ABT 1546-1602)
| | | | | | +---Henry Jolliffe (ABT 1586-)
| | | | | | | +---Thomason ?
| | | | | | +---Francis Jolliffe (ABT 1622-)
| | | | | | | +---Blanch Pearce
| | | | | | +---James Jolley (ABT 1682-APR 1754)
| | | | | | | +---Rose May
| | | | | +---Elizabeth Jolley (ABT 1713-)
| | | | | | +---Richard Osborne (-JUN 1667)
| | | | | | | +---Eme Varcoe
| | | | | | +---Richard Osborne
| | | | | | | +---Joan ?
| | | | | | +---Richard Osborne (-NOV 1707)
| | | | | | | | +---Arthur Michell (-ABT 1657)
| | | | | | | +---Constance Michell (ABT 1635-APR 1717)
| | | | | | | | +---Thomas Corne (-1647)
| | | | | | | +---Blanche Corne
| | | | | +---Blanche Osborne
| | | | | +---Bettres ?
| | | +---Florence Trethewy (ABT 1762-)
| | | +---Wilmot Hicks (ABT 1731-MAR 1816)
| +---Elizabeth Liddicoat (ABT 1836-)
| +---Martha Grigg (ABT 1801-)
+---Samuel Trethewey (25 JAN 1904-23 AUG 1971)
| +---Annie Phillips Thomas (14 OCT 1865-28 FEB 1953)
Hilary G Trethewey (ABT 1933-)
+---Gwendoline M Edwards