(19 SEP 1873-15 APR 1948)
+---Horace Andrew Tyson (23 JUN 1908-03 OCT 1970)
| | +---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)
| | +---Joel Upton (ABT 1746-ABT 1806)
| | | +---Sarah Harvey (ABT 1709-ABT 1788)
| | +---John Andrewartha (ABT 1768-ABT 1846)
| | | +---Mary Thomas
| | +---William Andrewartha (ABT 1805-27 FEB 1870)
| | | +---Mary Phillips (ABT 1772-ABT 1837)
| | +---Absolom Andrewartha (1847-05 FEB 1925)
| | | +---Jenifer E Richards (ABT 1806-ABT 1883)
| +---Elizabeth Jane Andrewartha (01 AUG 1872-11 APR 1952)
| +---Elizabeth Davey (18 JUN 1845-26 JUL 1910)
Janet Tyson (1953-)
+---Nancy Pitts (1916-)