What are the biggest fan theories about the twist in Other Mommy?

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Major Fan Theories

1. Real Mommy Is the Demon in Disguise Some viewers believe Ursula, the mother, is the sinister entity the whole time—or at least becomes it at some point—meaning the “Other Mommy” is not a separate supernatural presence but rather Ursula in an altered or hidden form. This plays on hints of doubles, impostors, and characters seeing Ursula behaving oddly. Support: Reddit discussions where people suggest the demon might be Ursula herself.

2. Bela’s Parentage Is More Than a Secret—She’s a Stand-in for the Woman the Demon Wants to Replace Fans speculate that Bela’s unknown biological father and Ursula’s past are crucial: the demon isn’t just after Bela’s heart because of a supernatural need, but because Bela is a link to humanity the entity desperately wants. Some suggest Bela is “special” in a way the demon needs. Support: In the ending explained articles, the demon wants to enter Bela’s heart to become more fully human, and the secrecy surrounding Bela’s parentage adds to the entity’s leverage.

3. The Ending from the Book Was Darker and May Imply a Body Swap or Complete Loss of Self Readers of the novel Incidents Around the House expect or theorize a worse outcome—one in which the demon fully takes over Bela (maybe through a body swap) or everyone dies, rather than Bela winning. Fans note the movie changes some endings significantly. Support: Redditors comparing book and film, mentioning imagined endings where Bela “switches with other mommy,” and that the movie “softened” the outcome.

4. The “Shhh” in the Post-Credit Scene Suggests the Demon Survived The idea that the final “shhh”—seen during the credits—implies Other Mommy is still present, possibly haunting Bela and the family anew, or that the demon’s psychological hold outlasts its physical form. Some read it as a setup for a sequel. Support: Explanations of the post-credit scene and its ambiguity are widespread in commentary.

5. Traumatic Metaphor Theory: Other Mommy Is Manifestation of Family Secrets and Emotional Distance A more symbolic reading: Other Mommy isn’t purely supernatural but a manifestation of Bela’s fears, confusion, and injuries caused by her parents’ emotional untruths—infidelity, secret pasts, parental guilt. The demon acts as emotional pressure rather than just a monster. Support: Ending explained pieces emphasize how confronting grief, accepting truth about parents, especially Ursula’s regret and secrets, are how Bela weakens the demon.

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These theories reflect how viewers are trying to make sense of the film’s twist using hints from the storytelling—character secrets, shape-shifting, the emotional weight parents carry, and the supernatural stakes over Bela’s identity and choices.