(25 MAY 1957-)
Dylan Rex Potter (12 DEC 1983-)
| +---James Tretheway (ABT 1732-)
| +---William Tretheway (ABT 1766-)
| | +---Elizabeth Skinner 
(ABT 1736-ABT 1800)
| +---Richard Tretheway (ABT 1793-)
| | +---Rebecca Haines (ABT 1770-ABT 1820)
| +---John James Tretheway (04 MAY 1841-09 OCT 1912)
| | +---Ann Spargo (ABT 1801-BEF 1851)
| +---John Spargo Tretheway (30 JUN 1866-)
| | +---Mary Jane May (ABT 1847-31 JUL 1930)
| +---Bernard Tretheway (ABT 1900-)
| | | +---James Buckland
| | +---Jane Buckland (ABT 1864-ABT 1928)
| | +---? Friend
| +---Gordon Tretheway (11 SEP 1933-)
| | +---Henrietta Agnes McConnell (09 FEB 1903-28 FEB 1977)
+---Heather Jean Tretheway (24 MAY 1958-)
+---Anna Jean Thorp (27 JUL 1935-)