(ABT 1806-)
+---Richard Henry Tyrrell (ABT 1830-17 MAY 1882)
| | +---Thomas Priske
| +---Constance Priske 
(17 SEP 1808-)
| +---Mary Rogers
Phillipa Ann Terrell (17 OCT 1849-11 DEC 1920)
| +---John Rescorle (ABT 1730-22 MAY 1807)
| +---John Rescorle (16 MAY 1757-22 MAY 1807)
| | | +---William Testick (25 APR 1696-)
| | +---Margery Testick (14 MAY 1732-08 JUN 1794)
| | +---Elizabeth Seccombe
| +---William Rescorle (09 OCT 1791-11 FEB 1855)
| | | +---William Testick (25 APR 1696-)
| | | +---William Testick (ABT 1735-)
| | | | +---Elizabeth Seccombe
| | +---Mary Testick (06 MAR 1763-19 DEC 1815)
| | | +---Nicholas Trevithick (ABT 1618-FEB 1698)
| | | +---Thomas Trevithick (ABT 1664-MAR 1723)
| | | | | +---Thomas Couch
| | | | +---Peternell Couch (ABT 1640-DEC 1696)
| | | | +---Elizabeth ?
| | | +---Thomas Trevithick (ABT 1697-FEB 1771)
| | | | | +---John Peters (ABT 1639-)
| | | | +---Mary Peters (ABT 1665-)
| | | | +---Marrian Spry (ABT 1643-)
| | +---Susanna Trevithick (ABT 1740-)
| | | +---John Bennett (ABT 1680-JAN 1717)
| | +---Mary Bennett (ABT 1706-1742)
| | +---Pricilla ? (ABT 1680-)
+---Mary Ann Rescorle (ABT 1828-10 OCT 1915)
| +---John Vivyan (ABT 1770-)
+---Grace Vivyan (03 APR 1792-MAY 1854)
+---Grace ? (ABT 1771-)