Kylie Jenner is the youngest member of the most talked-about family on the planet. But here is what most people still get wrong about Kylie Jenner: she does not have four siblings. She does not even have six. She has nine.
Nine brothers and sisters spread across three different marriages, two very different worlds, and a family tree so layered that even dedicated fans lose track of who belongs where. Some of them have been on your TV screens for over a decade.
Others have quietly built their own lives completely outside of Hollywood, never once chasing the spotlight their last name could have handed them.
So who are all nine of Kylie’s siblings? How old are they? And what are they actually doing now? Here is the complete breakdown, from oldest to youngest.
The Family Structure You Need to Understand First
Before the names, the structure matters. Kylie has one full sibling, Kendall Jenner, born to both Kris Jenner and Caitlyn Jenner. She also has four half-siblings from her mother’s side: Kourtney Kardashian, Kim Kardashian, Khloé Kardashian, and Rob Kardashian, and four half-siblings from her father’s side: Burt Jenner, Brody Jenner, Brandon Jenner, and Casey Jenner.
Caitlyn Jenner’s previous marriages produced the four Jenner half-siblings, while Kris Jenner’s previous marriage to the late Robert Kardashian produced the four Kardashian half-siblings.
That means Kylie grew up watching a wildly famous family on one side and a largely private family on the other. Both equally hers. Both shaped by very different choices.
The Jenner Side: Caitlyn’s Children From Previous Marriages
Burt Jenner, 46 (Born September 6, 1978)
Burton William Jenner, who goes by Burt, is the eldest of Caitlyn’s six children. Unlike most of his younger siblings, Burt largely avoided reality television, except Octane Academy, a Ford-sponsored competition show for aspiring race car drivers, which he auditioned for and won in season 2, taking home $100,000 in prize money.
Burt and Caitlyn have connected over car racing over the years, even competing together in the Baja 100 in November 2014. It is a relationship built on shared passion rather than shared screentime, and that seems to suit Burt just fine.
Burt is a father of four with his longtime girlfriend, Valerie Pitalo, including sons Bodhi and Behr, daughter Goldie, and a fourth child who arrived in September 2025.
Cassandra “Casey” Marino, 45 (Born June 10, 1980)
Even though Cassandra is connected to one of the biggest names in entertainment, she chose not to leverage family fame, instead building a career as an interior designer entirely on her own terms.
She is the most discreet of Kylie’s siblings, married to Michael Marino and sharing three children: Isabella, Francesca, and Luke.
Cassandra occasionally surfaced in family moments and was even signed on the Kardashian-Jenner Christmas card once, which famously left fans asking, “Who is Casey?” She has never sought the answer to go viral. That says everything about her.
Brandon Jenner, 44 (Born June 4, 1981)
Brandon is a singer-songwriter who made his reality television debut in the 2005 short-lived FOX series The Princes of Malibu alongside his brother Brody, years before the Kardashians became a household name.
Brandon shares twin boys, Bo and Sam, with his wife, Cayley, and is also the father of daughter Eva from a previous relationship. He has openly discussed his relationship with Kylie, admitting they have met up, but life keeps everyone busy. Despite the honest acknowledgment of distance, the warmth is clearly there.
Brandon has written candidly about his complicated relationship with Caitlyn in the past, but as of recent years, he and Brody appear to be on genuinely better terms with their parent.
Brody Jenner, 42 (Born August 21, 1983)
If there is one Jenner half-sibling the public feels like they know, it is Brody. He became a household name through his appearances on The Hills from 2007 to 2010 and later through his own shows. In 2025, he competed on season 3 of Special Forces: World’s Toughest Test and was one of only two contestants to survive all ten days of selection.
On July 12, 2025, Brody married professional surfer Tia Blanco at their home in Malibu, and in March 2026, the couple announced they were expecting their second child together, due in September.
Brody has been refreshingly candid about his relationship with Kylie and Kendall, making clear that while they do not speak every day, the bond is unconditional: “If Kylie or Kendall call me right now, I would walk out of this room and pick up the phone,” he said on a podcast. That is not distance. That is just a big family figuring out how to stay connected.
The Kardashian Side: Kris Jenner’s Children From Her First Marriage
Kourtney Kardashian, 45 (Born April 18, 1979)
The eldest Kardashian sibling is the one who has most publicly embraced life on her own terms in recent years. Kourtney shares three children with her ex Scott Disick: Mason, Penelope, and Reign. She later married Blink-182 drummer Travis Barker, and they welcomed baby Rocky together.
Kourtney has always been the sibling most likely to push back on the family machine, and it has made for some of the most compelling television moments across both Keeping Up With the Kardashians and its Hulu sequel.
Kim Kardashian, 44 (Born October 21, 1980)
Arguably the most famous sibling in any room, anywhere on earth. Kim has four children with her ex-husband Kanye West: North, Saint, Chicago, and Psalm.
Kim is also the sibling who arguably opened every door the younger Jenner girls walked through. The family’s rise to global fame traces directly back to her, and she has never stopped building on it, pivoting from reality star to SKIMS founder to law student in a trajectory that has kept her culturally relevant for nearly two decades.
Khloé Kardashian, 40 (Born June 27, 1984)
Khloé has two children with her ex Tristan Thompson: daughter True and son Tatum. She has built a reputation as the sibling who processes everything in public, including heartbreak, betrayal, and redemption, and turns it into relatable content without losing her dignity.
Her closeness to Kylie has been well documented across years of shared screen time, and the two have a warmth that reads as genuinely earned rather than performed for cameras.
Rob Kardashian, 37 (Born March 17, 1987)
Rob is Kris Jenner’s only son from her marriage to the late Robert Kardashian. He has spent much of the past decade stepping back from the public eye, though he remains a consistent presence in family moments.
Rob is the father of daughter Dream, whom he shares with his ex, Blac Chyna. His relationship with his sisters, particularly Khloé, has always been among the most emotionally honest storylines the family has shared publicly.
The One Full Sibling: Kendall Jenner
Kendall Jenner, 29 (Born November 3, 1995)
Kendall is the only sibling Kylie shares with both the same mother and the same father, making her Kylie’s sole full sibling in a family of nine.
The two grew up side by side through the entire Keeping Up With the Kardashians run, launched clothing lines together, and continue to orbit each other’s lives professionally and personally. Kendall built a supermodel career largely distinct from the family brand, walking for the world’s biggest designers, while Kylie built a cosmetics empire.
They are different. They are close. And they have been each other’s constant throughout one of the most unusual childhoods in modern celebrity history.
The Bigger Picture
Nine siblings. Two parents. Three marriages. One television dynasty. The Jenner-Kardashian family tree is genuinely unlike anything else in popular culture, not just because of the fame but because of how differently each branch chose to handle it.
Brody Jenner himself put it plainly, noting that despite being part of the famous Kardashian-Jenner clan, he is not living off a trust fund and does not use private jets like his sister Kylie. The contrast between siblings who chose the spotlight and those who quietly walked away from it is what makes this family more interesting than any storyline their shows have ever produced.
Kylie Jenner is the youngest of all of them. And in many ways, she is the one who inherited the most from every branch of the tree.
