Mia Rismoen was last seen in Phoenix, Arizona, on August 14, 2024, when she was four years old. The young female child, born May 22, 2020, was described in publicly available missing-person information as having blond hair and brown eyes. Mia did not disappear alone. Her younger brother, Alexander Rismoen, who was three years old at the time, vanished from Phoenix on the same date.
Publicly available case information identifies the disappearance as a family-abduction case and states that Mia and Alexander were taken by a non-custodial relative. Beyond that description, authorities and missing-child organizations have released very few details about exactly where in Phoenix the children were last seen, what occurred immediately before they disappeared, or how the relative allegedly removed them from the custody of the person legally responsible for them.
The disappearance of two children together immediately connected their cases. Alexander was born July 19, 2021, and public case records describe Mia and Alexander as brother and sister. Rather than treating Mia's disappearance as an unexplained situation in which a child simply wandered away or vanished under unknown circumstances, the available information specifically classifies both children as having been abducted by a relative who did not have legal custody. The identity of that relative has not been disclosed in the publicly accessible case summaries reviewed, nor have those sources provided details concerning a vehicle, possible destination, known associates, travel plans, or locations where the children might subsequently have been taken. Those omissions leave much of the story outside public view and make it especially important not to speculate about circumstances investigators have not released. What is clear is that Mia and Alexander remained the subjects of missing-child publicity after their disappearance, with their case information drawing on resources including the National Center for Missing & Exploited Children and The Charley Project.
As the months passed, information about the children continued to circulate through missing-person organizations rather than disappearing from public records. In December 2025, Alexander and Mia were added to the Adam Haseeb Memorial Pages maintained by For the Lost, where their case continued to be presented as an unresolved family-abduction matter. That listing should not be interpreted to mean the children were deceased; the page is a collection of missing-child case files maintained in memory of Adam Haseeb, and Mia's individual case information continued to ask the public for assistance in determining the children's whereabouts. The organization specifically directed anyone with information about Mia or Alexander to contact the Phoenix Police Department at 602-262-6151 and stated that information could be provided confidentially. Publicly available material reviewed for this synopsis does not identify an arrest, criminal charge, named suspect, or publicly confirmed recovery of either child.
The limited amount of publicly released information makes Mia's case particularly difficult to reconstruct in greater detail. There is no widely available account describing the moments immediately preceding the disappearance, no publicly identified witness whose statement explains how the children were taken, and no released investigative timeline showing their movements after August 14, 2024. There also is no publicly available explanation in the sources reviewed of the custody dispute or family circumstances that preceded the alleged abduction. What remains is the troubling outline of two very young siblings disappearing together from Phoenix and being taken, according to published missing-child information, by someone within their extended family who did not have custody of them. Mia was only four when she disappeared, and Alexander was only three, making both children completely dependent on the adults around them for their safety and well-being. In overview, Mia Rismoen's disappearance is an unresolved family-abduction case involving a four-year-old girl and her younger brother, both last seen in Phoenix on August 14, 2024; available public records identify a non-custodial relative as responsible for taking them, but provide few additional investigative details, and the continuing appeal for information reflects the enduring effort to determine where Mia and Alexander were taken and to bring the children safely home.Last Seen: Aug 14, 2024
