Vicki Leanne Alvisio 
(05 MAY 1975-)
| +---James Trethewy
| +---Richard Trethewy (ABT 1665-JAN 1741)
| +---Richard Trethewy (ABT 1700-ABT 1764)
| | +---Ann Martyn (ABT 1666-JUN 1738)
| +---Benjamin Trethewey (ABT 1738-)
| | | +---Humphrey Harris
| | | +---Gilbert Harris (ABT 1637-)
| | | +---Gilbert Harris (ABT 1665-)
| | | | | +---Richard Wills
| | | | +---Jenifer Wills (ABT 1632-)
| | | | +---Christian Best
| | +---Jenifer Harris (ABT 1696-1780)
| | | +---Thomas Hockin (-ABT 1607)
| | | +---John Hockin
| | | | +---Elizabeth ?
| | | +---John Hockin
| | | +---John Hockin (ABT 1616-DEC 1696)
| | +---Elizabeth Hockin (ABT 1658-)
| | +---Blanche ? (-ABT 1699)
| +---William Trethewey (ABT 1780-)
| | +---Elizabeth Woolcock
| +---Thomas Trethewy (ABT 1811-21 SEP 1871)
| | +---Sarah Mitchell (ABT 1786-)
| +---Samuel Trethewy (ABT 1832-BEF 1881)
| | +---Philippa Pearce (ABT 1811-13 FEB 1862)
| +---Thomas Trethewey (ABT 1868-1967)
| | +---Jane Binney (ABT 1835-)
| +---Marshall Grant Trethewey (06 JUN 1900-11 NOV 1961)
| | +---Martha Ann Bartlett (26 AUG 1877-08 NOV 1984)
| +---Marshall Arthur Trethewey (21 NOV 1936-)
| | +---Ada Joynes (09 AUG 1891-24 MAY 1995)
+---Debra Ann Trethewey (03 APR 1959-)
+---Gladys Dawn Crane (31 MAY 1938-)