(ABT 1843-)
Samuel John Harris (ABT 1872-)
| +---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 ?
| +---William Trethewy (ABT 1771-ABT 1827)
| | +---Wilmot Hicks (ABT 1731-MAR 1816)
| +---William Trethewy (ABT 1805-18 JUL 1874)
| | | +---John Kellow (ABT 1748-)
| | +---Catherine Kellow (ABT 1781-)
| | | +---John Pomeroy (ABT 1692-)
| | | +---Richard Pomeroy (ABT 1718-)
| | | | | +---Hennery Stoneman (ABT 1656-)
| | | | +---Thomasin Stoneman (ABT 1693-)
| | | | +---Thamasin ?
| | +---Catherine Pomeroy (ABT 1747-)
| | | +---Robert Philp
| | | +---James Philp (ABT 1688-MAR 1764)
| | | | +---Anne ?
| | +---Mary Philp (ABT 1716-)
| | +---Catherine ?
+---Kitty Trethewy (ABT 1839-)
+---Mary Ann Meager (ABT 1816-)