Elon Musk’s two best-known siblings, Kimbal Musk and Tosca Musk, have built careers that are substantially different from his. Kimbal is an entrepreneur focused on food, restaurants, urban farming, philanthropy, and entertainment technology. Tosca is a filmmaker who founded Passionflix, a romance-focused streaming service.
Elon Musk has two full siblings who have built public careers of their own: his younger brother Kimbal Musk and his younger sister Tosca Musk. Kimbal is known for technology entrepreneurship, restaurants, food activism, urban farming, philanthropy, and entertainment technology. Tosca is a filmmaker and the founder and CEO of Passionflix, a streaming service focused on romance adaptations and original programming.
The most significant professional link between Elon and Kimbal came early, when the brothers co-founded Zip2, an online company that provided maps and door-to-door directions. After Zip2 was acquired by Compaq in 1999, their careers developed in noticeably different directions.
Who are Elon Musk’s siblings?
Kimbal Musk is Elon’s younger brother. His career began in technology but later concentrated on food, restaurants, agriculture, nonprofit work, and sustainability. He has also moved into entertainment technology through Nova Sky Stories.
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Tosca Musk is Elon’s younger sister. Her professional work has centered on filmmaking, production, and streaming. She founded Passionflix, a subscription service built around screen adaptations of romance novels.
This article focuses on Kimbal and Tosca, the two siblings most directly identified in the available corporate and biographical sources. It does not attempt to provide a complete genealogy of the Musk family.
Kimbal Musk: from Zip2 to food and sustainability
The brothers’ early business: Zip2
Kimbal and Elon Musk worked together professionally before either became widely known. They co-founded Zip2, an early online business that combined maps, local information, and door-to-door directions. The company helped newspapers and other organizations put local business information and navigation tools online.
Compaq acquired Zip2 in 1999. The business was subsequently merged into Yahoo Maps. This is the clearest documented example of Elon and Kimbal building a company together. Their later professional identities were less alike: Elon concentrated on ventures involving electric vehicles, energy, spaceflight, brain-computer interfaces, and tunneling technology, while Kimbal increasingly focused on food systems and community-oriented businesses.
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The Kitchen and the move into restaurants
In 2004, Kimbal co-founded The Kitchen, a restaurant company built around sourcing food directly from local farmers. The business reflected the direction that would define much of his later work: connecting restaurants with regional agriculture and making food production part of the dining experience.
Kimbal has publicly been described as a chef and food activist. He also served on the board of Chipotle from 2013 to 2019. Those roles placed him at the intersection of hospitality, food sourcing, restaurant operations, and broader discussions about how food is produced and consumed.
Big Green and food education
Kimbal is a co-founder and executive director of Big Green, a U.S. 501(c)(3) nonprofit focused on giving people opportunities to grow food. Its work connects gardening with food education and access to fresh produce.
Big Green is important to understanding Kimbal’s public career because it shows that his interest in food extends beyond restaurants. His work has also involved helping schools and communities engage directly with growing food, rather than treating agriculture as something separate from everyday life.
Square Roots and controlled-environment agriculture
In 2016, Kimbal co-founded Square Roots, an urban-farming company. Tesla’s biography describes the business as growing fresh, local greens in climate-controlled, AI-equipped shipping containers.
The model is an example of controlled-environment agriculture: plants are grown indoors, where variables such as temperature, lighting, and water can be managed more closely than in conventional outdoor farming. The approach is designed for urban settings and raises practical questions about energy use, operating costs, logistics, and the economics of producing food near consumers.
Readers interested in this part of Kimbal’s work can explore Kimbal Musk’s Square Roots as an example of indoor urban farming and the wider controlled-environment agriculture sector. It is a business and technology reference, not an endorsement of any affiliate offer.
Nova Sky Stories
Kimbal’s portfolio is not limited to food. His current Tesla biography identifies him as co-founder and CEO of Nova Sky Stories, a company that develops light-drone technology for artists and producers.
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Drone-based light shows use coordinated aircraft, lighting, software, and choreography to create large-scale visual performances. Nova Sky Stories gives Kimbal’s career another dimension: alongside restaurants, agriculture, and philanthropy, he is involved in technology designed for entertainment and live production.
Tosca Musk: filmmaker and founder of Passionflix
A career in film and production
Tosca Musk’s public career is centered on filmmaking rather than technology entrepreneurship or restaurants. She has worked in film and production and later founded a streaming company aimed at a clearly defined audience: viewers of romance stories and adaptations of romance novels.
That focus makes Tosca’s career distinct from both of her brothers’ best-known businesses. Her connection to Elon Musk is part of her biography, but Passionflix is her own creative and commercial venture, built around content development, production, licensing, and distribution.
What is Passionflix?
Passionflix is a subscription streaming service offering original movies and series, including screen adaptations based on bestselling romance novels. The company’s official website identifies Tosca Musk as its founder and CEO.
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Passionflix occupies a niche that differs from broad general-interest streaming platforms. Its identity is built around romance-focused programming and the relationship between popular romance publishing and filmed entertainment. The company’s 2026 press material, for example, discussed its optioning of My Summer in Seoul, illustrating its continuing interest in adapting romance literature for the screen.
Passionflix’s plans and catalog can change, so readers should check the company’s official site for current pricing, availability, and programming before subscribing. The service has stated subscription pricing on its homepage, but any specific monthly price should be treated as time-sensitive rather than permanent.
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For readers specifically interested in Tosca’s business, Tosca Musk’s Passionflix is the most direct destination to explore its romance adaptations and original programming. No affiliate relationship or special offer is implied here.
Tosca’s corporate role
A Georgia Secretary of State corporate filing from 2022 lists Tosca Musk as an officer of PassionFlix Inc., including CEO, CFO, and secretary roles in the filing shown. That document corroborates her corporate connection to the company, while Passionflix’s current website is the stronger source for describing her present public role as founder and CEO.
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How Kimbal and Tosca’s careers compare with Elon’s
| Sibling | Best-known professional areas | Key connection or venture |
|---|---|---|
| Elon Musk | Electric vehicles, energy, spaceflight, brain-computer interfaces, and tunneling technology | Co-founder of Zip2 with Kimbal |
| Kimbal Musk | Restaurants, food systems, urban farming, philanthropy, and drone-based entertainment technology | Co-founder of Zip2; co-founder of The Kitchen, Big Green, and Square Roots |
| Tosca Musk | Filmmaking, production, romance adaptations, and streaming | Founder and CEO of Passionflix |
The comparison should not be reduced to the idea that Kimbal and Tosca simply followed Elon into business. Elon and Kimbal did share an important early entrepreneurial chapter through Zip2, but Kimbal’s later work developed around food, agriculture, and sustainability. Tosca built a separate creative and media career, culminating in a romance-focused streaming company.
There are broad themes that overlap—technology, entrepreneurship, and ambitious company building—but the industries and audiences are different. Kimbal’s public work is oriented toward food production, restaurants, communities, and live entertainment. Tosca’s is oriented toward filmmaking and viewers of romance stories.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is documented—and what should be treated cautiously?
The strongest documented facts are the siblings’ relationships, Elon and Kimbal’s work on Zip2, Kimbal’s roles in food and sustainability ventures, Kimbal’s Nova Sky Stories position, and Tosca’s founding and leadership of Passionflix.
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Claims about current net worth, private residences, exact ownership percentages, family arrangements, awards, children, or other personal details require separate and current verification. Such details are often repeated online without reliable primary documentation and are not necessary to understand the siblings’ professional histories.
Further reading
For broader context about Elon Musk’s upbringing, business relationships, and career, consider Walter Isaacson’s Elon Musk biography. Published by Simon & Schuster in 2023, it is a biography of Elon rather than a dedicated book about Kimbal and Tosca, so it should be treated as supplementary reading—not the definitive account of Elon Musk’s siblings.
Sources and current-status notes
- Tesla’s official biography of Kimbal Musk describes his work with Zip2, The Kitchen, Big Green, Square Roots, and Nova Sky Stories.
- Tesla corporate disclosures identify Elon and Kimbal Musk as brothers.
- Passionflix’s official homepage identifies Tosca Musk as founder and CEO and describes the service’s romance-focused subscription model.
- Passionflix press material identifies Tosca as founder and CEO and documents the company’s romance adaptation activity.
- A 2022 Georgia corporate filing provides additional confirmation of Tosca Musk’s officer roles at PassionFlix Inc.
Frequently Asked Questions
How many siblings does Elon Musk have?
Elon Musk has two siblings central to this account: his younger brother, Kimbal Musk, and his younger sister, Tosca Musk.
What does Kimbal Musk do?
Kimbal Musk is best known for co-founding Zip2 with Elon Musk, then building a career in restaurants, food activism, urban farming, philanthropy, and entertainment technology. He is associated with The Kitchen, Big Green, Square Roots, and Nova Sky Stories.
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Tosca Musk is a filmmaker and the founder and CEO of Passionflix, a streaming service focused on romance adaptations and original programming.
Did Elon Musk and Kimbal Musk work together?
Yes. Elon and Kimbal Musk co-founded Zip2, an early online maps and directions company. Compaq acquired Zip2 in 1999, after which it was merged into Yahoo Maps.
What is Passionflix?
Passionflix is a subscription streaming service featuring original movies and series, including adaptations based on bestselling romance novels. Current pricing and availability should be checked on the company’s official website because they can change.
The Bottom Line
Kimbal Musk and Tosca Musk have established careers separate from Elon Musk’s. Kimbal’s path runs from Zip2 into restaurants, food education, urban farming, sustainability, and drone-based entertainment technology. Tosca’s path runs through filmmaking to Passionflix, the romance-focused streaming company she founded and leads. Their most important shared business history is the early Zip2 venture between Elon and Kimbal.
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