He was born into a family of actors , including his father Cellier and half-sister Antoinette , his grandfather was the Gilbert and Sullivan - conductor François Cellier . Frank was born into a family of actors including his father Cellier and half-sister Antoinette . His grandfather was the Gilbert and Sullivan conductor François Cellier . He was born into a family of actors , including his father Frank and half-sister Antoinette , his grandfather was the Gilbert and Sullivan conductor François Cellier .