(ABT 1779-)
| +---Mary Best 
Hannah Sweet Best
| +---Andrew Elvans
| +---John Elvans (ABT 1706-)
| | +---Susanna Harris
| +---John Elvans (ABT 1746-MAY 1830)
| | | +---William Lewarne
| | +---Elizabeth Lewarne (ABT 1716-)
+---Ann Elvans (ABT 1778-)
| +---William Perkin (-1688)
| +---John Parkin
| | +---Mary ?
| +---William Parkin (ABT 1690-)
| +---William Parkin (ABT 1719-1784)
| | | +---Richard Morlyn (-ABT 1730)
| | +---Anne Morlyn (ABT 1695-)
| | | +---Nicholas Trethewy (-ABT 1680)
| | +---Julyan Trethewy (ABT 1652-)
| | | +---Bartholomew James (-ABT AUG 1636)
| | | | +---Sicelie ? (-1608)
| | +---Petronell James (-ABT 1692)
| | +---Joan ?
+---Mary Parkin (ABT 1748-23 APR 1830)
| +---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
| +---Benjamin Osborne (ABT 1687-NOV 1738)
| | +---Bettres ?
+---Elizabeth Osborne (ABT 1721-)
| +---Thomas Tregenza
| +---Thomas Tregenza (ABT 1633-)
| | +---Julian ? (-30 APR 1665)
| +---Nicholas Tregenza (ABT 1655-APR 1734)
| | +---Mary ?
+---Ann Tregenza (ABT 1687-)