All Her Fault ending explained: Peter is holding some dark secrets

All Her Fault premiered on November 6, 2025, with all 8 episodes dropping together.

Marissa Irvine goes to pick up her young son, Milo, from a scheduled playdate at the home of a woman named Jenny Kaminski. However, when she arrives, no one there knows who Jenny or Milo is. This sets up the panic and conflict in All Her Fault.

By the end of the show, some shocking reveals come to light. Carrie is the biological mother of Milo. Peter, being the narcissistic person he is, had swapped the babies when they met with an accident years ago and lost their actual child.

Read on to know the complete ending of All Her Fault.

Disclaimer: This article includes spoilers.

---

Here is what happened by the end of All Her Fault

Marissa realizes that she has fallen victim to a fake text and number. Moreover, the GPS tracker she had placed in Milo's bag had been removed, suggesting he had been abducted. This further leads to the beginning of the investigation.

The police narrow down to arrest Carrie Finch as the prime suspect, a nanny employed by Jenny. Carrie had also disappeared since then. Milo's own nanny, Ana Garcia, has seen Carrie meeting a mysterious man who was then revealed to be Kyle, an ex-convict. The investigation then leads to Kyle's dead body, and this is when the case deepens, suggesting a bigger conspiracy.

Amid the chaos, Marissa forms an unlikely friendship with Jenny, who seems equally devastated by the situation. Jenny works as a publishing agent with thriller author Logan Lee. The media attention and coverage of the kidnapping case gradually began to affect her career and mental state. Marissa and Jenny bond over shared trauma; however, Jenny isn't that innocent.

---

Peter is hiding some dark secrets in All Her Fault

The discovery of Milo's old toy, which went missing long before Carrie was hired, comes to light. It appeared to be in Kyle's possession, and this raised the suspicion more towards Marrisa's own family being involved deep down. It is revealed that Peter, Milo's father, has been hiding some dark secrets.

Brian is also kept away from knowing the truth that it was actually Peter who caused his accident and not Lia. Peter manipulated Lia to bear the guilt of her brother's disability. The tensions escalate; on the other hand police inform the family that Milo is safe and has been rescued from a motel.

Police also discovered a dead body in the same motel, and the family regrouped to process everything. Carrie sneaks into the house with a gun, and a chaotic standoff erupts.

Colin, Marissa's business partner, is shot dead while Carrie seems shocked and distraught, suggesting that killing was not her goal. She came to reveal the truth, and that is when the show's most shocking twist comes to light, revealing Carrie Finch to be the biological mother of Milo, and yes, it's all Peter's narcissistic brain behind this chaos.

---

Carrie is Milo's biological mother in All Her Fault

Six years ago, when she gave birth to Milo and met a car accident, the same crash that involved the Irvine family. Peter's own baby died in the accident, and when he realized Carrie's newborn was alive, he made a cold decision to swap babies. Marissa never knew that Peter lied to her, claiming that their son survived. He did this to preserve family image and show how far he would go to maintain control.

After years, Carrie discovered that when she crossed paths with Milo and began to notice some similarities. As she spends more time around the Irvines, the pieces begin to fall into place. The timelines of her accident and Milo’s age align, while Kyle also marked how Milo looks so much like her ex.

In the final confrontation, Carrie returns not to take Milo again, but to ensure his safety from Peter. Despite this, Peter kills her at the end to silence her forever.

---

Catch the show now only on Peacock.