Other Mommy is a 2026 American supernatural psychological horror film directed by Rob Savage and written by Nathan Elston. The film is based on the 2024 novel Incidents Around the House by Josh Malerman. It stars Jessica Chastain as a mother who must do everything to protect her daughter (played by Arabella Olivia Clark) from a supernatural entity that resembles her. Jay Duplass, Dichen Lachman, Arian Moayed, and Karen Allen comprise the supporting cast. James Wan serves as a producer through his Blumhouse–Atomic Monster banner, in association with Spin a Black Yarn.
Other Mommy is scheduled to be released in the United States by Universal Pictures on October 9, 2026.
Premise A paranormal entity known as "Other Mommy" takes on the appearance of a young girl's mother, threatens her family, and begins haunting her home.
Cast Jessica Chastain as Ursula, Bela's mother Chastain also portrays the "Other Mommy", a supernatural entity Jay Duplass as Russell, Bela's father and Ursula's husband Arabella Olivia Clark as Bela, a young girl targeted by the Other Mommy Dichen Lachman Arian Moayed Karen Allen as Grandma Ruth, Bela's grandmother Sean Kaufman Adam Silver Rosie Anne O’Gorman
Production In April 2025, it was announced that an adaptation of the novel Incidents Around the House was in development, with Rob Savage directing, Nathan Elston writing the screenplay, and Jessica Chastain starring in the lead role. In May, Jay Duplass joined the cast. Principal photography took place in Dublin, Ireland between May 12 and July 9, 2025. Dichen Lachman joined the cast in the following month. In July, Arabella Olivia Clark, Sean Kaufman, Adam Silver, Rosie Anne O'Gorman and Karen Allen were added to the cast with the film being retitled to Other Mommy.
Release Other Mommy is scheduled to be released in the United States on October 9, 2026. The film was previously scheduled to release on May 8, 2026.
See also "The Father-thing", short story "The New Mother", short story Coraline, novella
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