+--Richard Pierson  (1516-)
   +--Richard (or Henry) Pierson  (1545-BEF. 1567)
   |  |  +--Edward Church 
   |  +--Elizabeth Church  (ABT. 1516-)
   |     |  +--Liman Hendon  (ABT. 1485-AFT. 1540)
   |     +--Thomassine Hendon 
+--Abraham Pierson  (ABT. 1590-4 JUN 1650)
|  +--Johanna Harwood 
Thomas Pierson  (1614-1701)
|        +--John Drake 
|     +--Bernard Drake  (1530-10 APR 1586)
|     |  |        +--Thomas Granville 
|     |  |     +--Thomas Grenville  (ABT. 1449-18 MAR 1512/13)
|     |  |     |  +--Elizabeth Gorges 
|     |  |  +--Roger Grenville  (1477-7 JUL 1524)
|     |  |  |  |  +--Otho "Otes" Gilbert 
|     |  |  |  +--Isabella Gilbert  (ABT. 1456-)
|     |  |  |     +--Elizabeth Hill 
|     |  +--Anne "Amye" Granville  (1513-18 FEB 1576/77)
|     |     |  +--Richard Whitleigh  (ABT. 1449-)
|     |     +--Margaret Whitleigh  (ABT. 1478-)
|     |        |  +--John Trenowth 
|     |        +--Margaret Trenowth  (ABT. 1460-)
|     |           +--Honour Tregarthin  (ABT. 1432-)
|  +--John Drake  (1566-11 APR 1628)
|  |  |  +--Bartholomew Fortescue 
|  |  +--Gertrude Fortescue  (1538-10 FEB 1600/01)
|  |     |  +--Morris Moore 
|  |     +--Ellen Moore  (ABT. 1505-)
|  |        |        +--John Bonville 
|  |        |     +--William Bonville  (30 AUG 1393-18 FEB 1459/60)
|  |        |     |  |     +--Henry Fitzroger 
|  |        |     |  |  +--John Fitzroger  (ABT. 1341-ABT. 1372)
|  |        |     |  |  |  +--Elizabeth de Holand  (ABT. 1320-13 JUL 1387)
|  |        |     |  +--Elizabeth Fitzroger  (1371-10 APR 1414)
|  |        |     |     +--Alice Bonville Cheddar  (ABT. 1346-)
|  |        |  +--John Bonville  (ABT. 1435-1491)
|  |        |  |  +--Isabelle Kirkeby  (ABT. 1403-)
|  |        +--Cicely Bonville  (ABT. 1488-)
|  |           |  +--William (Dennis) Dennys  (ABT. 1416-)
|  |           +--Alice Dennys  (ABT. 1442-AFT. 1500)
|  |              +--Joan Saint_Aubyn  (ABT. 1418-)
+--Mary Drake  (1594-NOV 1643)
   |  +--William Button  (ABT. 1537-)
   +--Dorothy Button  (1568-13 DEC 1631)
      +--Mrs William Button  (ABT. 1541-)