(-1817)
+---William Williams (16 SEP 1816-17 JAN 1870)
| | +---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)
| | +---John Andrewartha (ABT 1645-ABT 1720)
| | | | +---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 1777)
| | | +---Elizabeth Orgal (-21 SEP 1737)
| | +---Richard Andrewartha (ABT 1750-ABT 1806)
| | | +---Sarah Harvey (ABT 1709-ABT 1788)
| +---Susanna Andrewartha (ABT 1780-1844)
| +---Susanna Pearce (ABT 1748-)
Elizabeth Ann Williams (26 OCT 1853-15 JAN 1872)
+---Elizabeth Foss (03 SEP 1820-11 MAY 1866)