Sibling Rivalry is a black comedy directed by Carl Reiner. Marjorie, played by Kirstie Alley, is a homemaker who is frustrated with her mundane life and her lack of personal fulfillment. She feels suffocated by her daily routine and her relationship with her husband Harry, played by Scott Bakula.
Marjorie's sister Jeanine, played by Jami Gertz, is a free-spirited woman who lacks ambition and direction. She is jealous of Marjorie's seemingly perfect life and feels inferior to her.
The story takes a turn when Marjorie cheats on Harry with a stranger in a hotel room during a business trip. However, the stranger dies after the encounter, and Marjorie is left to deal with the consequences of her actions.
Meanwhile, Jeanine meets and falls in love with the dead man's brother, played by Bill Pullman. She sees this as an opportunity to finally outshine her sister and be the one who has a successful relationship.
The plot descends into a series of hilarious situations as the sisters confront the aftermath of Marjorie's infidelity and navigate their complex family dynamics. The film explores themes of jealousy, sibling rivalry, and the pressure of living up to societal expectations.
Overall, Sibling Rivalry is a witty and entertaining movie that offers a fresh take on the traditional family drama genre.