The Musk-Boucher Dynasty: A 2025 Deep Dive Into The Three Children Of Grimes And Elon Musk

The world's most talked-about and unconventional celebrity family continues to evolve, with new public details emerging about the three children shared by Canadian musician Grimes and tech mogul Elon Musk. As of late December 2025, the focus remains firmly on the unique names, the surprising third child, and the complex, often dramatic co-parenting dynamic that has recently played out on social media and in the courts. This deep dive provides the most current profile of X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus, the children at the center of this futuristic family.

The relationship between Grimes (Claire Boucher) and Elon Musk has always been anything but ordinary, yielding three children with names straight out of a science fiction novel. The latest updates, including a public dispute over communication and a legal push to formalize parental rights, confirm that their family life is as headline-grabbing as their professional careers at Tesla, SpaceX, and in the music industry. Understanding the children requires first understanding the parents who created this unique dynasty.

The Unconventional Family Profile: Grimes and Elon Musk Biography

The parents of X, Y, and Tau are two of the most influential and boundary-pushing figures in their respective fields, blending technology, art, and an almost futuristic vision of the world.

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Elon Reeve Musk (Father)

• Born: June 28, 1971, Pretoria, South Africa.
• Current Age: 54 (as of late 2025).
• Career Highlights: Co-founder of the electronic payment firm PayPal. Founder, CEO, and CTO of SpaceX, leading the charge in space exploration and colonization. CEO and Product Architect of Tesla, Inc., revolutionizing electric vehicles. Owner and CTO of X (formerly Twitter). Founder of the artificial intelligence company xAI and co-founder of Neuralink.
• Family: Musk has a total of 14 children with four different women, including his first wife Justine Wilson, Grimes, and Neuralink executive Shivon Zilis.

Claire Elise Boucher (Grimes) (Mother)

• Born: March 17, 1988, Vancouver, British Columbia, Canada.
• Current Age: 37 (as of late 2025).
• Career Highlights: A highly acclaimed Canadian musician, singer, songwriter, and visual artist. Her music is known for its experimental fusion of dream pop, electronic, R&B, and art pop genres. Notable albums include Visions and Art Angels.
• Public Persona: Known for her ethereal, futuristic aesthetic and deep engagement with technology, artificial intelligence, and philosophy, which she often incorporates into her art and public commentary.

The Three Children: Names, Meanings, and Current Ages (2025 Update)

Grimes and Elon Musk share three children, each with a name that reflects their parents' fascination with technology, space, and a non-traditional approach to life. The children are often referred to by their unique nicknames.

1. X Æ A-Xii (Nickname: 'X')

Birth Date: May 4, 2020. Current Age (Dec 2025): 5 years old.

X Æ A-Xii was the couple's first child together and instantly became a global sensation due to his name. The original name, X Æ A-12, had to be legally changed to X Æ A-Xii to comply with California law, which only permits Roman alphabet characters and hyphens.

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• Name Breakdown: The name is a fusion of technical and symbolic elements. 'X' is the unknown variable. 'Æ' is the elven spelling of 'Ai' (love and/or artificial intelligence). 'A-Xii' is a nod to the Lockheed SR-71 Blackbird, an aircraft known for its speed and lack of weaponry, which they refer to as their "favorite aircraft."
• Current Life: X Æ A-Xii has occasionally been seen in public with his father, including a high-profile appearance at a Tesla event and a trip to Washington, D.C. in 2025.

2. Exa Dark Sideræl Musk (Nickname: 'Y')

Birth Date: December 2021. Current Age (Dec 2025): 4 years old.

News of the couple's second child, a daughter, was a complete surprise to the public. Exa Dark Sideræl was born via surrogate, and her existence was only revealed in March 2022 when Grimes mentioned her during an interview.

• Name Breakdown: 'Exa' is a reference to exaFLOPS, a unit of computing power. 'Dark' represents "the unknown," which Grimes described as "the beautiful mystery of our universe." 'Sideræl' (pronounced 'sigh-deer-ee-el') is a more elven spelling of 'sidereal,' meaning relating to the stars, and is also a nod to the character Galadriel from The Lord of the Rings.
• Surrogacy: The decision to use a surrogate for their daughter was a private matter that only came to light after her birth, adding another layer to the family's non-traditional structure.

3. Techno Mechanicus (Nickname: 'Tau')

Birth Date: June 2022. Current Age (Dec 2025): 3 years old.

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The existence of the third child, a son named Techno Mechanicus, was revealed in September 2023 in the biography Elon Musk by Walter Isaacson. Like his sister, 'Tau' was born via surrogate, just six months after the birth of 'Y'.

• Name Breakdown: 'Techno Mechanicus' continues the technological theme, likely referencing machinery, engineering, and the electronic music genre techno. His nickname, 'Tau,' is a letter in the Greek alphabet, often used in mathematics and physics, maintaining the scientific naming convention.
• The Surprise: The confirmation of a third child born in quick succession after a public "split" underscored the complicated and on-again, off-again nature of the couple's relationship.

The Latest Co-Parenting Dynamic: Lawsuits and Social Media Drama (2025)

The most recent news surrounding the Grimes and Elon Musk family dynamic in 2025 highlights the challenges of co-parenting between two global figures with dramatically different lifestyles.

The 'Blocking' Incident on X

In a public display of their strained communication, Grimes called out Elon Musk on the platform X (formerly Twitter) in early 2025, claiming he had blocked her. This public plea, though brief, drew massive attention, revealing the difficulties in maintaining a stable co-parenting relationship, even for the mother of three of his children. Grimes later clarified that her sole focus was on her co-parenting responsibilities.

The Parental Rights Lawsuit

Further cementing the volatile nature of their post-relationship life, Grimes filed a petition in a California court to "establish parental relationship" in 2024. This legal action is a formal step to legally identify the parents of the children and establish custody and support arrangements. While the details of the lawsuit remain private, the filing itself, which was still ongoing into 2025, signals a formal effort by Grimes to secure her legal standing in the lives of X, Y, and Tau.

The 'Separate Lives' Dynamic

Grimes has openly discussed the challenges of raising children in a highly scrutinized environment, stating her desire to have a "very good relationship" with her children and acknowledging the unique family dynamic. The children are effectively being raised between the worlds of a billionaire tech pioneer focused on space and AI, and an avant-garde artist focused on digital realms and music, creating a truly unique upbringing that continues to fascinate the public. The ongoing public and legal back-and-forth ensures that the Musk-Boucher family remains one of the most closely watched family stories of the decade.