Elsa Lanchester. Actress: Witness for the Prosecution. Elsa Sullivan Lanchester was born into an unconventional a family at the turn of the 20th century. Her parents, James "Shamus" Sullivan and Edith "Biddy" Lanchester, were socialists - very active members of the Social Democratic Federation (SDF) in a rather broad sense - and did not believe in the institution of marriage and being tied to.