Billie Eilish’s older brother, Finneas O’Connell, is a Grammy-winning songwriter, producer, and recording artist who has played a major role in shaping her music career. Known professionally as FINNEAS, he has collaborated with Billie since her earliest recordings, helping create some of the most recognizable songs in contemporary pop music. Their partnership has earned multiple Grammy Awards and two Academy Awards for Best Original Song. In August 2026, Finneas also celebrated a major personal milestone when he married his longtime partner, Claudia Sulewski, in California, with Billie officiating their wedding ceremony.
Although Billie is one of the world’s most recognizable singers, her brother has established an equally important reputation behind the scenes. Their creative partnership began at home in Los Angeles and developed into an internationally successful musical collaboration built around songwriting, experimentation, and a close family relationship.
Who Is Billie Eilish’s Brother?
Billie Eilish’s brother is Finneas Baird O’Connell, professionally known as FINNEAS.
He was born on July 30, 1997, in Los Angeles, California, making him approximately four years older than Billie.
Finneas is a singer, songwriter, record producer, composer, and former actor.
He became widely recognized for producing and co-writing Billie’s music, including songs from her debut album and subsequent releases.
However, his professional achievements extend beyond his sister’s recordings.
He has released solo albums, collaborated with other major musicians, and composed music for film and television.
His distinctive production style often combines intimate vocals, unusual sound effects, and carefully arranged instrumentation.
Billie Eilish and Finneas’ Childhood
Billie and Finneas grew up in Los Angeles with their parents, Maggie Baird and Patrick O’Connell.
Both parents worked in entertainment and encouraged their children to explore creative interests.
The siblings were homeschooled, giving them opportunities to spend time developing their musical abilities.
Finneas began writing songs at a young age and became interested in recording and production.
Billie also developed a passion for music, singing, and performance during childhood.
Their home environment encouraged experimentation rather than requiring them to follow a conventional musical path.
This freedom eventually became important when the siblings began recording original songs together.
Their early work demonstrated how effectively they could combine Billie’s distinctive vocals with Finneas’ songwriting and production skills.
How Finneas Helped Launch Billie’s Career
One of the defining moments in Billie Eilish’s early career came with the release of Ocean Eyes.
Finneas originally wrote the song for his band before Billie recorded her own version.
The recording was uploaded to SoundCloud in 2015 and quickly attracted attention.
Its popularity helped introduce Billie to a wider audience and created opportunities for professional music releases.
Finneas continued working closely with his sister as her career developed.
Rather than relying entirely on established industry producers, the siblings created much of their music together.
Their early recordings were notable for their understated production and emotionally direct songwriting.
The success of Ocean Eyes became the foundation for one of pop music’s most recognizable sibling partnerships.
The Bedroom Studio That Changed Pop Music
Finneas produced much of Billie’s debut album, When We All Fall Asleep, Where Do We Go?, in his childhood bedroom.
Released in 2019, the album became a major commercial and critical success.
It included songs such as bad guy, bury a friend, and when the party’s over.
The project demonstrated that internationally successful pop music could be created outside traditional recording studios.
Finneas used digital production techniques, layered vocals, and unconventional sounds to establish the album’s distinctive atmosphere.
His approach helped Billie develop a recognizable musical identity.
The album later earned major Grammy recognition, including Album of the Year.
Its success also established Finneas as one of the most sought-after young producers in the industry.
Their Two Academy Award Wins
Billie Eilish and Finneas O’Connell have won two Academy Awards for Best Original Song.
Their first Oscar came in 2022 for No Time to Die, the theme song from the James Bond film of the same name.
The song combined dramatic orchestration with Billie’s restrained vocal performance.
Finneas helped write and produce the recording, which became another major achievement for the siblings.
Their second Academy Award arrived in 2024 for What Was I Made For?, written for the film Barbie.
The emotional ballad explored themes of identity, uncertainty, and personal purpose.
It became one of the film’s most widely recognized songs.
Winning two Oscars demonstrated that Billie and Finneas could create music that connected with audiences beyond conventional pop releases, including major Hollywood productions.
Finneas’ Role in Billie’s Recent Music
Finneas continued collaborating with Billie on her third studio album, Hit Me Hard and Soft, released in May 2024.
The album featured songs including Birds of a Feather, Lunch, and Chihiro.
Its production explored a wide range of musical textures while maintaining the siblings’ recognizable creative approach.
The project received strong attention from listeners and music critics.
Birds of a Feather became particularly popular, reaching audiences around the world.
The siblings also continued performing and discussing their creative process as Billie’s career expanded.
Their collaboration remains central to her recorded music, even as both pursue separate professional opportunities.
Finneas O’Connell’s Solo Music Career
Finneas has developed a successful recording career under his own name.
He released his debut solo studio album, Optimist, in 2021.
The project allowed him to explore personal songwriting themes and establish an artistic identity separate from his work with Billie.
His second studio album, For Cryin’ Out Loud!, followed in October 2024.
The album featured a more live-band-oriented sound and demonstrated his interest in experimenting with different musical arrangements.
Finneas has also worked with artists including Selena Gomez, Justin Bieber, and Camila Cabello.
These collaborations have expanded his reputation as a producer capable of working across different musical styles.
His solo work continues to attract listeners interested in his songwriting and vocal performances.
Finneas’ Acting Career Before Music
Before becoming internationally recognized as a music producer, Finneas worked as an actor.
He appeared in the musical television series Glee, portraying a character named Alistair during the show’s final season.
He also appeared in Modern Family and the 2011 comedy film Bad Teacher.
These early acting experiences introduced him to professional entertainment environments.
Although he eventually concentrated primarily on music, his acting background remains part of his career history.
His experience across different creative fields helped him develop a broad understanding of performance and storytelling.
Billie Eilish’s Role in Finneas’ Wedding
Finneas married actress and content creator Claudia Sulewski on August 29, 2026.
The couple exchanged vows at San Ysidro Ranch in Montecito, California, after dating since 2018.
Their wedding attracted attention because Billie Eilish officiated the ceremony.
Her involvement highlighted the close personal relationship she shares with her older brother.
The celebration reportedly included several entertainment personalities, including Justin and Hailey Bieber.
For Billie and Finneas, the wedding represented an important family occasion beyond their musical achievements.
It also demonstrated how their bond extends into major personal milestones.
The Sibling Partnership Behind Billie Eilish’s Music
Billie Eilish and Finneas O’Connell have built a musical partnership that began in childhood and developed into international success.
Their achievements include multiple Grammy Awards, two Oscars, commercially successful albums, and influential recordings.
While Billie remains the public face of many of their projects, Finneas has played a defining role in the songwriting and production process.
His own career as a singer, composer, and producer continues developing alongside their collaborations.
Their relationship is unusual not simply because they are siblings, but because they have maintained a creative partnership while building individual professional identities.
As both continue working in music and entertainment, their shared history remains an important part of their success.
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