+---Ken Drewett
| | +---Nicholas Cowlin (ABT 1843-)
| | +---John Cowlin (19 FEB 1872-14 NOV 1930)
| | | +---Elizabeth ? 
(ABT 1846-)
| +---Lillian (Lily) Cowlin (21 MAY 1900-APR 1966)
| | +---John Ridge (ABT 1843-)
| +---Ada Alicia Ridge (ABT 1871-)
| +---Mary Jane Bicknell (ABT 1848-)
Graham Drewett
+---Dorothy ?