(ABT 1726-)
+---John Snell (ABT 1752-)
| | +---James Trethewy
| | +---Richard Trethewy (ABT 1665-JAN 1741)
| | +---James Trethewy (ABT 1703-)
| | | +---Ann Martyn 
(ABT 1666-JUN 1738)
| +---Phillippa Trethewy (ABT 1727-)
| | +---Anthony Jane
| +---Loveday Jane (ABT 1707-1777)
| +---Elizabeth Syndercombe
+---Thomas Snell (ABT 1787-DEC 1873)
| | +---John Best (ABT 1648-AFT 1696)
| | +---John Best (ABT 1683-)
| | | +---Grace John
| | +---Abraham Best (ABT 1717-11 MAR 1772)
| | | | +---Robert Phillips
| | | +---Mary Phillips (17 SEP 1683-01 DEC 1799)
| | | +---Joan Sampson
| +---Temperance Best (ABT 1758-)
| | +---Joseph Stephens
| +---Temperance Stephens (ABT 1726-DEC 1809)
| +---Jane Stick
+---Thomas Snell (ABT 1814-)
| | +---Thomas Snell
| +---Grace Snell (ABT 1790-SEP 1875)
| | +---John Best (ABT 1648-AFT 1696)
| | +---John Best (ABT 1683-)
| | | +---Grace John
| | +---Abraham Best (ABT 1717-11 MAR 1772)
| | | | +---Robert Phillips
| | | +---Mary Phillips (17 SEP 1683-01 DEC 1799)
| | | +---Joan Sampson
| +---Ann Best (ABT 1764-)
| | +---Joseph Stephens
| +---Temperance Stephens (ABT 1726-DEC 1809)
| +---Jane Stick
Caleb Snell (ABT 1856-)
| +---Solomon Whitford (ABT 1791-)
+---Amy Whitford (ABT 1827-)
+---Mary Phillips (ABT 1796-)