Mark Thomas Udy (08 APR 1974-)
| +---Richard Burgess Sayer (ABT 1818-26 DEC 1854)
| +---Richard Nicholas Sayer (1844-30 OCT 1902)
| | | +---John Oxenham (-1838)
| | +---Jemima Oxenham 
(03 OCT 1826-)
| | +---Elizabeth Norman
| +---Richard Burgess Sayer (1873-19 JUL 1960)
| | | +---Richard Blake (1815-08 JUN 1893)
| | +---Hester Blake (1843-25 JUL 1914)
| +---Victor Vincent Sayer (20 SEP 1912-)
| | +---Mabel Ann Saywell (1882-10 FEB 1959)
+---April Elizabeth Sayer (06 APR 1947-)
+---Marie Elizabeth George