Jon's sisters, perhaps? (or even a younger brother who was killed in the war--though that seems the sort of thing that might have been mentioned.) Geoff might have younger siblings too--do we ever know whose side of the family is the cousin in Autumn Term who practised pretty wiles on grown-ups? Or Trennels employees seconded to hawk-chasing?
no subject
Jon's sisters, perhaps? (or even a younger brother who was killed in the war--though that seems the sort of thing that might have been mentioned.) Geoff might have younger siblings too--do we ever know whose side of the family is the cousin in Autumn Term who practised pretty wiles on grown-ups? Or Trennels employees seconded to hawk-chasing?