Du Maurier was also a cousin of the Llewelyn Davies boys, who served as J. M. Barrie's inspiration for the characters in the play Peter Pan, or The Boy Who Wouldn't Grow Up.
Du Maurier tamén era prima dos nenos de Llewelyn Davies, que serviron como inspiración de J. M. Barrie para as personaxes da obra Peter Pan or The Boy Who Would not Grow Up.