So Evil, My Sister 1974

Synopsis:

After her husband dies, a woman begins to have a nervous breakdown and is consoled by her younger sister. Soon, however, other members of the family begin to suspect the younger woman's motives.

Directed by: Reginald Le Borg
Written by: Tony Crechales
Release date: 1974-12-25
Runtime: 80 minutes
Tagline: A grotesque nightmare…
Cast:
Susan Strasberg
Susan Strasberg
Brenda 
Faith Domergue
Faith Domergue
Millie Hartman 
Charles Robinson
Charles Robinson
Jerry (as Charles Knox Robinson) 
Sydney Chaplin
Sydney Chaplin
George 
John Ashton
John Ashton
Brock 
Links:
IMDb So Evil, My Sister movie stills
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Also known as:
  • Psycho Sisters
  • The Sibling