+---Jonathan Job (ABT 1829-)
| +---Eliza ? 
Ada Job (ABT 1869-)
| +---James Trethewy
| +---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 ?
| +---John Trethewey (ABT 1795-1855)
| | | +---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
+---Mary Ann Trethewey (ABT 1826-)
| +---John Cock
+---Mary Ann Cock (ABT 1796-BEF 1851)
+---Mary ?