Caitlyn Jenner might be a whole new person for the rest of the world, but when it comes to her daughters Kendall and Kylie Jenner, she's just "dad." 18-year-old Kylie wished the transgender star a very happy birthday on Wednesday, referring to her as "dad."

Even though Caitlyn is being referred to as a "she" by the media, many people in her family are having a hard time making the transition, while insisting on even calling her by her old name.

Kylie shared an Instagram photo of the two on her account and captioned it with, "Early birthday lunch with @caitlynjenner Happy birthday dad what an amazing year for you."

 Early birthday lunch with @caitlynjenner Happy birthday dad what an amazing year for you.

A photo posted by King Kylie (@kyliejenner) on Oct 27, 2015 at 2:07pm PDT

Even Kylie's sister Khloe admitted back in August that no one in the Kardashian family likes to refer to the former Olympian as "Caitlyn."

"We don't like to say that Bruce is gone, per se. We, my sisters and I, we will call Caitlyn 'Bruce,' and we've been told that's completely fine," Khloe told Australia's The Project in a chat to promote the sisters' Kardashian Kids clothing line.

Khloe also said that one of the reasons why she still calls her Bruce is because her voice is yet to change, especially when they talk on the phone.

"She has told us we are allowed to call her any name we want to. Because on the phone, when she calls me, it's the same voice as Bruce. And if I'm not physically with her, it's hard to remember in the moment that I'm talking to Caitlyn, if that makes sense," Khloe said.

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Kylie Jenner, Caitlyn jenner