(1835-11 JAN 1912)
+---Thomas Polkinghorne (1875-MAR 1921)
| | +---Henry Bowden (12 FEB 1809-)
| +---Elizabeth Ann Bowden 
(1834-18 NOV 1890)
| | +---Philip Trewartha (-ABT 1624)
| | +---John Trewartha (ABT 1598-1687)
| | | | +---Henry Cock (ABT 1537-ABT 1616)
| | | +---Agnes Cock (ABT 1564-)
| | | | +---Lawrence Rondall alias Tolsethen
| | | +---Margery Rondall (-ABT 1623)
| | +---Philip Andrewartha (ABT 1642-MAY 1705)
| | | | +---John Carthew
| | | +---Mary Carthew (ABT 1609-MAR 1671)
| | | | +---Robert Jenken (-ABT 1569)
| | | | +---Richard Roberts alias Trevernan alias Jenken (-ABT 1624)
| | | | | +---Jennet ? (-ABT 1588)
| | | +---Eleanor Roberts (ABT 1567-ABT 1655)
| | | | +---John Tremeryn
| | | +---Johan or Jane Tremeryn (-ABT 1603)
| | | +---Jennet ? (-ABT 1588)
| | +---John Andrewartha (ABT 1680-ABT 1720)
| | | | +---Henry Cock (ABT 1537-ABT 1616)
| | | | +---William Cock alias Connerwartha (ABT 1572-1645)
| | | | | | +---Lawrence Rondall alias Tolsethen
| | | | | +---Margery Rondall (-ABT 1623)
| | | | +---Henry Cock (ABT 1604-ABT 1659)
| | | | | | +---James Edwards
| | | | | +---Alice Edwards (-ABT 1614)
| | | +---Mary Cock (ABT 1656-MAY 1720)
| | | | +---Edwards Williams
| | | +---Cheston Williams (-ABT 1665)
| | | +---Agnes Jenkin
| | +---Richard Andrewartha (02 NOV 1718-17 OCT 1767)
| | | +---Mary Whitfar (ABT 1684-ABT 1748)
| | +---Richard Andrewartha (ABT 1755-19 OCT 1822)
| | | +---Mary Shugg (ABT 1722-ABT 1782)
| | +---John Andrewartha (ABT 1785-)
| | | +---Rebecca Lobb (22 FEB 1756-21 NOV 1828)
| +---Rebecca Andrewartha (ABT 1811-25 DEC 1882)
| +---Anne Jones (ABT 1781-)
Robert Polkinghorne (1905-JAN 1906)
+---Martha Ann Heywood (ABT 1873-)