Which British actor and theatre director born in 1875 is the grandparent of Benedict Campbell?
Benedict Campbell:  Campbell's maternal grandparents are Sir Lewis Casson and Dame Sybil Thorndike. Lewis Casson: Sir Lewis Thomas Casson MC (26 October 187516 May 1969) was a British actor and theatre director, and the husband of actress Dame Sybil Thorndike.
Sir Lewis Casson