Who is Kylie Jenner’s ‘mystery’ half-sister, Casey? Caitlyn Jenner’s youngest daughter sparked an online hunt for a member of the Kardashian clan few had heard of when she posted about her at Christmas

Jan 5 , 2024

Casey and Kylie Jenner are certainly familiar with each other – even if the internet has no idea who the former is. Photo: @KardashianBish/Twitter

Kylie set Instagram alight this Christmas when she posted a holiday photo with an inscription mentioning family members Kris, Kourtney, Kim, Khloé, and Kendall – and a ‘mysterious’ Casey

As one of Caitlyn Jenner’s lesser-known children, Casey has shied away from the spotlight – unlike her famous siblings – and, no, she wasn’t in I Am Cait either

Kylie Jenner recently set off a social media detective hunt when she posted a throwback photo of her family at Christmas – with one “mystery” name signing off the card along with the famous clan.

Fan comments reveal confusion about the text beneath the photo Kylie Jenner posted recently. Photo: @kyliejenner/Instagram

The photo inscription read, “Merry Christmas, with love, The Jenners and The Kardashians, Bruce, Kris, Kourtney, Casey, Kimberly, Khloé, Robert, Kendall and Kylie.”

Kylie Jenner posted this at Christmas and confused plenty of people in the process. Photo: @kyliejenner/Instagram

Netizens quickly took to the comments section to express their confusion as one name stood out on the list – Casey – although she doesn’t appear in the photograph.

“Everyone wondering who Casey is and what did they do to her,” wrote one commenter.

Cassandra Marino, Caitlyn Jenner, Brody Jenner, Linda Thompson and Brandon Jenner pictured together in May 2019 in Malibu, California. Photo: Getty Images

But the search didn’t last too long as internet sleuths were quick to decipher the identity of the seemingly unknown Kardashian-Jenner.

Casey, full name Cassandra “Casey” Marino, is in fact one of Caitlyn Jenner’s children from her marriage to now ex-wife Chrystie Scott, according to US media. That makes Casey Kendall and Kylie Jenner’s half-sister.

Here’s what we know about the lesser known Jenner.