(1700-)
+---John Penberthy (22 JUN 1723-)
+---Isaac Penberthy (ABT 1753-1820)
| | +---Samuel May
| +---Margaret May 
(24 OCT 1725-)
+---Isaac Penberthy (23 APR 1786-1870)
| | +---Thomas Phillips
| +---Elizabeth Phillips (1759-)
| +---Frances ?
Anne Penberthy (ABT 1820-)
| +---John Williams
+---Ann Williams (02 FEB 1789-)
+---Elizabeth ?