Sisters is a 1972 American psychological horror film directed by Brian De Palma and starring Margot Kidder, Jennifer Salt, and Charles Durning. It follows a French Canadian model's separated conjoined twin who is suspected of having committed a brutal murder witnessed by a newspaper reporter in Staten Island, New York City.

Olympia Dukakis was an American actress. She performed in more than 130 stage productions, more than 60 films and in 50 television series. Best known as a screen actress, she started her career in theater. Not long after her arrival in New York City, she won an Obie Award for Best Actress in 1963 for her off-Broadway performance in Bertolt Brecht's Man Equals Man.