Sidney Fletcher is George Sanderson's godson. At the beginning of Season Two he was engaged to Rosie. He is a supporter of the Abbotsford football club, much to the displeasure of his godfather.
Sidney served as a member of the Gratitude board, working to find jobs for impoverished girls forced to live at the convent.
Rosie: Uh, Jack, you remember Sidney Fletcher?
Jack: Yes. Yes, of course. You're Rosie's cousin.
Sidney: George's godson. No, we're, um... not related by blood. Stroke of luck, as it turns out.
Phryne: upon seeing Fletcher's enormous house Whatever kind of shipping Mister Fletcher dabbles in must be doing very nicely.