He is the first cousin, once removed, of Bill Pertwee.
He is the younger brother of Dariel Pertwee.
Sean Pertwee's first role was in Prick Up Your Ear starring Gary Oldman who played Jim Gordon in the Dark Knight Trilogy, now currently (2014) he again plays a role next to a new Jim Gordon in Gotham.
He is the son of Jon Pertwee.
He is the nephew of Michael Pertwee.