William Evans
| +---John Best (ABT 1648-AFT 1696)
| +---John Best (ABT 1683-)
| | +---Grace John 
| +---Thomas Best (24 AUG 1708-)
| | | +---Robert Phillips
| | +---Mary Phillips (17 SEP 1683-01 DEC 1799)
| | +---Joan Sampson
| +---Thomas Best (ABT 1755-10 OCT 1813)
| | +---Mary James (ABT 1712-25 APR 1763)
| +---Thomas Best (ABT 1795-OCT 1864)
| | | +---James Trethewy
| | | +---Richard Trethewy (ABT 1665-JAN 1741)
| | | +---John Trethewey (ABT 1690-)
| | | | +---Ann Martyn (ABT 1666-JUN 1738)
| | | +---John Trethewey (ABT 1720-)
| | | | | +---Phillip Mellow (ABT 1660-JAN 1711)
| | | | +---Temperance Mellow (ABT 1690-MAY 1765)
| | | | +---Jane ?
| | +---Jane or Jenifer Trethewey (ABT 1755-)
| | | +---Joseph Grose
| | +---Jane Grose (ABT 1724-)
| | +---Jane ?
| +---John Best (23 JAN 1825-30 APR 1915)
| | | +---William Tucker
| | | +---William Tucker (ABT 1755-)
| | | | | +---William Little
| | | | +---Joan Little (ABT 1726-)
| | +---Grace Tucker (ABT 1796-15 JUL 1839)
| | | +---Francis Tregenza
| | | +---John Tregenza (ABT 1733-)
| | | | +---Hannah Rundle
| | +---Ann Tregenza (ABT 1765-)
| | | +---James Trethewy
| | | +---Richard Trethewy (ABT 1665-JAN 1741)
| | | +---Thomas Trethewy (ABT 1688-APR 1716)
| | | | +---Ann Martyn (ABT 1666-JUN 1738)
| | | +---Walter Trethewy (ABT 1710-NOV 1766)
| | | | +---Elizabeth Rogers
| | +---Ann Trethewy (ABT 1735-)
| | +---Ann Marten (-FEB 1780)
+---Adelaide Paubla Best (14 NOV 1869-28 AUG 1962)
| +---Stephen Symons (ABT 1811-)
+---Jane Symons (13 JAN 1837-02 OCT 1916)
+---Maria Cock (ABT 1816-)