Milaine Desaulniers is Brie Larson’s younger sister and a math teacher in California. She is also known as Mimsy Desaulniers. Canyon High School lists her as a math teacher and ASB director. She has a small film link too. Under the name Mimsy, she played Genevieve in the 2012 short film The Arm, which Brie helped direct.
In this article, you’ll learn about Milaine Desaulniers’ childhood with Brie, her school career, her film role, their love of Animal Crossing, and the rare times the sisters have stepped into the spotlight together.
Growing Up With Brie Larson
Before Brie Larson became an Oscar winner, the sisters shared a small home and a big family change.
Brie was born Brianne Sidonie Desaulniers. She grew up in California with her younger sister. Their parents, Heather and Sylvain Desaulniers, were chiropractors.
Brie showed an interest in acting when she was very young. She was accepted into the American Conservatory Theater in San Francisco. Soon, acting became more than a hobby.
Their mother decided to give the dream a real chance.
ELLE reported that Heather drove Brie and her younger sister, Mimsy, to Los Angeles with little money. The family rented a small studio in Burbank. The three slept in the same room and lived on a tight budget while Brie went to auditions.
For Milaine, Hollywood was part of home life from a young age. Yet she did not grow up to choose the same job as her sister.
One Sister, Several Public Names
Her name can look confusing online.
ELLE called Brie’s younger sister Mimsy. Photos from the 2019 Oscars named her Milaine Desaulniers. California education payroll data uses the name Raya Milaine Desaulniers.
The names appear in different parts of her public life.
Mimsy is also the name used at school and in her film credit.
This helps explain why one person can seem like several people in search results.
A Career in Math and Student Life
Her main career is in schools, not films.
Canyon High School’s current staff page lists Mimsy Desaulniers as a math teacher and ASB director.
That means she works in the classroom and with student leaders.
Her earlier job at Valencia High School had the same mix.
In 2020, The Santa Clarita Valley Signal wrote about a Valentine’s Day project at Valencia High. ASB students placed paper hearts around campus. Each heart had a student’s name and a kind note.
Mimsy, who was named as the math teacher and ASB director, said the goal was to help students feel loved and seen.
The project gives a useful view of her work.
She teaches math, but she also helps students plan events and build school spirit.
From Valencia High to Canyon High
Milaine Desaulniers has spent years in public education.
She has worked in the William S. Hart Union High School District for several years. Valencia High records also named Mimsy as its ASB director.
Today, Canyon High lists her in that same kind of role.
Her path looks steady.
Brie’s work takes her to sets, premieres, and press tours. Her sister’s work takes place in classrooms, school halls, and student meetings.
Both jobs need care and discipline, but they happen in very different worlds.
A Small Role in The Arm
She also has a real film credit.
Mimsy Desaulniers played Genevieve in The Arm, a short film from 2012.
Brie Larson, Sarah Ramos, and Jessie Ennis directed the film. The story follows a teen boy who starts a text based romance after meeting a girl at a yogurt shop.
The role gave the sisters a creative project together.
The film later won a Special Jury Prize for Comedic Storytelling at the Sundance Film Festival.
Milaine did not turn that part into a long acting career.
Her public work after that points much more strongly to teaching.
That makes The Arm a fun side note, not the center of her adult life.
A Rare Oscars Night Together
One of her clearest public moments came on February 24, 2019.
Milaine Desaulniers arrived with Brie Larson at the 91st Academy Awards in Hollywood.
Photos from the night show them together on the red carpet at the Dolby Theatre.
Brie was already an Oscar winner by then. She had won Best Actress for Room in 2016. She was also moving into a new stage of fame through Captain Marvel.
Her sister did not use the night to launch a public brand of her own.
She went back to a much quieter life.
That is why the photos still stand out. They offer a rare look at the sisters together as adults.
Animal Crossing Has Followed Them for Years
One of the warmest stories about the sisters has nothing to do with an awards show.
It is about Animal Crossing.
Brie said she and Milaine loved the Nintendo game when they were young. Their mother made a simple rule. The sister who finished her homework first got to play first.
Years later, Animal Crossing: New Horizons gave them a new way to share that old hobby.
In a 2020 interview covered by Nintendo Life, Brie said she was excited to make new memories with Milaine. They could visit each other’s game islands while talking on FaceTime.
The story feels ordinary, and that is part of its charm.
They grew up with a movie dream in the family. They also fought for game time after homework.
Those small memories make their bond easier to picture.
The Los Angeles Years Shaped Both Sisters
The move to Los Angeles was made for Brie’s acting career, but it changed life for both girls.
Their mother had to make limited money stretch. The family lived in a small place near the studios. Auditions became part of the week.
Brie has spoken about the move with both warmth and pain. Her parents were also splitting up around that time.
Her younger sister lived through the same move and the same home changes.
Milaine has not told that story in long public interviews. So her own feelings about those years remain private.
What we do know is simple. She was there through the early years, long before fame made Brie Larson known around the world.
A Different Kind of Public Life
Milaine Desaulniers did not follow Brie into a full time screen career.
She chose a job built around students.
Teaching math means showing up each day, planning lessons, helping teens through hard topics, and keeping a class moving.
ASB work adds another layer. It means helping students lead, plan, and take part in school life.
That work is not seen on a red carpet. It can still shape many lives.
Her career also gives a useful answer to one of the main questions people ask about her: what does Brie Larson’s sister do?
She teaches math and leads student activities at a California high school.
The Sister Bond Stayed Visible
Brie and Milaine took different paths, but a few public moments show that their bond stayed active.
The 2019 Oscars gave fans one view.
Animal Crossing gave another.
The game story is especially telling because it connects their adult lives to childhood. They were not meeting for a press event. They were sharing a game they had loved for years.
Brie even spoke about making new memories with her sister through the game.
That kind of detail adds more than a list of family facts.
It shows how two sisters can grow into very different jobs and still keep a simple thread from childhood.
Why Mimsy Is the Name You See at School
The name Mimsy appears again and again in the most useful parts of her public life.
Canyon High lists Mimsy Desaulniers on its staff page.
Valencia High used the same name in school material.
The Arm also credits Mimsy Desaulniers.
ELLE used Mimsy when it wrote about Brie’s younger sister moving to Los Angeles as a child.
For readers, that is worth knowing because a search for Milaine can quickly lead to Mimsy or Raya.
The names point to different parts of the same story.
Life Away From Celebrity Culture
Milaine has a famous sister, a red carpet appearance, and a film credit.
Yet her adult life is not built around celebrity.
The current school listing gives the clearest picture.
She is part of a school staff. Her role is tied to math and student life.
That is enough to tell her story without guessing about money, romance, or private plans.
There is also no need to turn privacy into a mystery.
Her life is simply less public than Brie’s.
That difference is normal, even inside a famous family.
Why People Search for Milaine Desaulniers
Most interest begins with Brie Larson.
Fans want to know about the sister who shared those early Los Angeles years and later appeared beside her at the Oscars.
But the search becomes more useful once Milaine’s own work comes into view.
She has spent years in education. She has helped with student leadership. She had a small role in a Sundance winning short. She has also kept a close family link through shared hobbies and rare public events.
That gives her a clear story of her own.
She is close to Hollywood, but her daily life belongs to a school.
Final Thoughts
Milaine Desaulniers is Brie Larson’s younger sister, but she built an adult life far from full time Hollywood work.
Known as Mimsy in school and film credits, she works as a math teacher and ASB director at Canyon High School.
She also played Genevieve in The Arm, attended the 2019 Oscars with Brie, and has shared a love of Animal Crossing with her sister since childhood.
The two grew up through a major move and then chose very different careers.
Brie stepped into the global spotlight. Milaine chose the classroom.
Both paths grew from the same family story.
If you enjoy stories about people who grew up close to Hollywood but built quieter lives of their own, read our profile of Alexander Bauer, the private son of Melanie Griffith and Steven Bauer.
