Spoiler warning — cast timeline: This article identifies which performers play Ruth and Graham before and after a multi-year time jump. Later warnings appear before ending-related character details.
The cast of *The Last House* is built around one family. Greta Lee plays Ann Delgado, Wagner Moura plays Jason Delgado, and four younger actors share the roles of the couple's children, Ruth and Graham. Riley Chung and Emma Ho play Ruth, while Noah Alexander Sosnowski and Gabriel Barbosa play Graham.
That six-person cast gives the film a clear focus. Every major decision affects the same family of four, so the performances carry both the survival conflict and the changing relationships inside the house.
This article explains who plays each Delgado, how the family members relate to one another, and what each character contributes to the story. The separate ending explainer covers the rain creatures, the final release, and the last radio voice in greater detail.
The Last House cast at a glance
- Actor — Character — Place in the Delgado family
- Greta Lee — Ann Delgado — Mother of Ruth and Graham; Jason's wife
- Wagner Moura — Jason Delgado — Father of Ruth and Graham; Ann's husband
- Riley Chung — Young Ruth Delgado — The Delgado daughter before the time jump
- Emma Ho — Older Ruth Delgado — Ruth after the family has spent years inside
- Noah Alexander Sosnowski — Young Graham Delgado — The Delgado son before the time jump
- Gabriel Barbosa — Older Graham Delgado — Graham after the family has spent years inside
The two Ruths and two Grahams are part of the planned time jump, not alternate timelines or a production recast. Each child has a younger and older performer because the confinement lasts for years.
Spoiler warning — Ann's survival role: The following section discusses how the Delgados live through the long confinement and Ann's work during the flooded climax.
Greta Lee plays Ann Delgado
Ann is Jason's wife and the mother of Ruth and Graham. She is one of the family's two heads and carries much of the household's physical and emotional stability.
Ann is the family's rock because she keeps working when ordinary household routines stop being possible. Jason concentrates on building, repairing, and finding openings in the barrier. Ann grows food and finds new uses for the materials still inside the house. Their jobs overlap, but Ann's contribution makes survival a daily system instead of a series of emergency fixes.
Ann gives the children a different kind of protection from Jason. He tries to control the immediate danger; her steadier support does not depend on having every answer. Ann keeps the film from treating protection as a job that belongs only to the father.
The later water sequences make that role physical. Lee trained with the cast for the submerged-set work, and Ann participates directly in the effort to survive the flooded house. Her performance connects care, endurance, and action.
Spoiler warning — Jason's character arc: The following section reveals how Jason's need for control affects the family and the choice he makes near the ending.
Wagner Moura plays Jason Delgado
Jason is Ann's husband and the father of Ruth and Graham. He is a fierce protector who believes he must maintain calm and stability while the family is in danger. That belief explains both his usefulness and his main weakness.
He is the family's builder and hunter. When the house develops a small opening, Jason turns it into a way to catch animals and support the family's water system. He repairs tools, repurposes objects, and looks for practical answers. Those actions give the family food and structure, but they also reinforce his belief that every threat can be controlled, fixed, or destroyed if he works hard enough.
Jason and Ann form a working partnership rather than competing to lead. She relies on cultivation and improvisation while he focuses on construction and defense. Their different methods matter more as the children grow older and form their own judgments.
That conflict defines his dramatic function. Jason represents the protective instinct that keeps a family alive, then becomes dangerous when it refuses to listen. Near the end, Ruth recognizes communication where he sees another attack. Jason's decisive change is not a new invention or weapon. It is his willingness to trust his daughter and stop fighting. The full ending explanation examines the result of that choice without changing this cast article into a second finale recap.
Spoiler warning — Ruth's role in the mystery: The following section identifies Ruth's older performer and explains how her observations change Jason's final decision.
Riley Chung and Emma Ho play Ruth Delgado
Riley Chung plays Ruth as a younger child, and Emma Ho plays her after the story moves forward in time. Keeping the same character across two performers lets the movie show that Ruth's way of observing the house is not a single lucky guess. Her perspective develops while the family adapts to confinement.
Ruth is Ann and Jason's daughter and Graham's sister. She notices patterns that the adults overlook because they are focused on supplies, repairs, and defense. Her drawings and predictions can appear supernatural, but the movie presents her understanding as intuition and a child's openness, not a confirmed power.
That distinction is central to Ruth's dramatic role. She does not solve the family's problem because she has secret information. She gives the family another way to interpret the evidence already around them. Jason reads unfamiliar behavior as a threat; Ruth considers whether it may be communication. Her relationship with her father therefore becomes the point where the family's practical survival skills meet the need to listen.
Chung establishes the child who first faces the impossible situation. Ho carries the effects of years inside while preserving Ruth's attention to what others dismiss. Together, they let Ruth challenge Jason without taking his place as the practical protector.
Spoiler warning — Graham and the time jump: The following section discusses Graham's older performer and what the years inside the house change about the children's place in the family.
Noah Alexander Sosnowski and Gabriel Barbosa play Graham Delgado
Noah Alexander Sosnowski plays young Graham, and Gabriel Barbosa plays the older version. Graham is Ann and Jason's son and Ruth's brother. Like Ruth, he grows up inside a crisis created by adults but cannot be understood only as a child waiting to be rescued.
Ruth has the more explicit connection to the central mystery. Graham has a different purpose in the family story. The change from Sosnowski to Barbosa makes the length of the confinement visible and shows that Jason and Ann are raising children while also managing food, water, shelter, and fear. The time jump is not only a survival statistic; it changes the parents' relationship with a son who is becoming older inside a closed environment.
Graham also balances Ruth within the ensemble. Casting the siblings separately in both periods presents them as two people living through the same confinement, not one interchangeable narrative device.
The story does not assign Graham a hidden power, secret identity, or separate mythology. His dramatic importance comes from the family's passage through time and from the fact that survival must preserve four individual people, not only the two parents who make most of the plans.
Spoiler warning — family outcome: The following section refers to the final change in how Jason listens to Ruth and how the Delgados function together at the end.
Why the Delgado family is the movie's real ensemble
The Last House keeps its main cast small because the pressure comes from watching one household change. Ann and Jason provide two forms of adult protection: her sustained care and adaptation, and his building and defense. Ruth brings a different interpretation of the threat. Graham makes the years and the children's changing needs impossible to ignore.
No single Delgado carries the family through the whole story. Jason eventually has to listen to Ruth; her insight reaches the turning point only when he acts on it. Ann makes the long confinement possible, while Graham's growth shows its cost. Their relationships build the dramatic argument.
For the post-watch answers about what the family encounters, use Pixel Twelve's ending explainer. For the separate question of whether these actors could return, the current *The Last House 2* sequel status keeps confirmed announcements apart from speculation. The movie page also collects Pixel Twelve's existing reporting on the production and release.
