+---Harold Bateman Duckett (-16 MAR 1977)
| +---Annie Thwaites 
+---Derek Duckett (24 OCT 1925-)
| | +---Benjamin Buck
| +---Doris Buck (-13 JUL 1975)
| +---Clara Sowry
Geoffrey John Duckett (02 OCT 1957-)
| +---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
+---June Tretheway (10 MAY 1930-)
+---Henrietta Agnes McConnell (09 FEB 1903-28 FEB 1977)