Question: Which British actor and theatre director born in 1875 is the grandparent of Benedict Campbell?

Context paragraphs:
Richie Campbell (actor): Richard "Richie" Campbell (born 8 February 1982) is a British actor.  He grew up in North London.  He is best known for his comedic turn as local bully "Tyrone" in British film "Anuvahood" and his role of Ndale Kayuni in "Waterloo Road", which airs on BBC One.  Campbell has won a Screen Nation Award for his portrayal of Dominic Hardy in TV show "The Bill".  His work has included Breathless, Mid Morning Matters with Alan Partridge, and recurring roles in "The Silence" and Channel 4 drama "Top Boy".  As a film actor, Campbell has appeared in Wilderness, The Plague, The Firm, Victim, Fast Girls and Get Lucky.  In addition Campbell has done extensive work in West End theatre including, Dirty Butterfly at Young Vic theatre, Lower Ninth at the Donmar Warehouse, Truth and Reconciliation at Royal Court Theatre and in 2013 playing Tom Robinson alongside Robert Sean Leonard as Atticus Fitch in "To Kill A Mockingbird" at Regents Park Open Air Theatre.

Christopher Bentivegna: Christopher Matthew Bentivegna is an American singer, actor and theatre director born in Pennsylvania.  He has performed in and directed many theatrical productions in New Jersey, New York.  and Louisiana.  Since 2003, he has lived in New Orleans, Louisiana where he continues his professional acting, singing, and directing career.

Laurent Pelly: Laurent Pelly is a French opera and theatre director born in Paris in 1962.  He enjoys a career as one of France's most sought after directors of both theatre and opera, working regularly in the world’s most prestigious houses.

Alma Bećirović: Alma Bećirović is a Bosnian filmmaker and theatre director born in Sarajevo.  She won several awards for her short feature films and documentaries.  Most notably Best Screenplay at the Göteborg International Film Festival for the short feature film "On Wednesdays" in CineBosnia selection and Best Short Feature film at the Torino Film Festival for the same film.  Award of Germany Ministry of Culture for the documentary film "Survived and Lived Through One More Day" at the Internationale Kurzfilmtage Oberhausen.

Benedict Campbell: Benedict "Ben" Campbell (born June 12, 1957) is a Canadian actor and voice actor whose work has consisted primarily of providing voices for television cartoons and video games. Early in his career, Campbell also appeared in a number of live action works.  Campbell comes from an acting family; his parents are Douglas Campbell and Ann Casson, and he is the brother of Dirk 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.

William Mesguich: William Mesguich is a French actor and director born in 1972, the son of theatre director Daniel Mesguich.  With Philippe Fenwick, he created La Compagnie de l'Étreinte in 1998.

Roger Martin (actor): Roger Martin is a British actor and theatre director whose acting career has spanned four decades, during which time he has appeared in the theatre and films, while his television roles have included sitcoms and serious dramas.  Martin is also the Artistic Director of Fresh Look Theatre and Chairman of the Eastside Educational Trust.

Jean Lambert-wild: Jean Lambert-wild is a theatre-maker and theatre director born in 1972 in Réunion.  He is the artistic director of Theatre de l'Union – Centre Dramatique National du Limousin, and the director of "L'Académie de l'Union", Ecole Nationale Supérieure de Théâtre du Limousin.

Matt Littler: Matt Littler (born 19 March 1982) is a British actor and director born in Bury, Greater Manchester, United Kingdom.  He is most famous for playing the role Max Cunningham from 1997 to 2008 in the British Channel 4 soap opera "Hollyoaks".

Supporting paragraphs: Benedict Campbell Lewis Casson
Answer: Sir Lewis Casson