Kendall and Kylie Jenner still call Caitlyn Jenner "dad," despite her transition five years ago.
Caitlyn, once Bruce, made the transition in 2015 after discovering she was a transgender woman.
But daughters Kendall and Kylie, whom Caitlyn shares with Kris Jenner, have not erased the traditional male title, still calling her "father".
"Mostly, Bruce raised them," she explained, "and Caitlyn is enjoying her life with them."
She went on to tell how Kendall once asked why they still call her â??daddyâ??.
Caitlyn had replied, "I am your father, and I will always be your father until the day he dies."
Kendall, 24, made a beautiful dedication to Caitlyn on 'Father's Day'.
"I love you," the supermodel wrote alongside a Caitlyn video in which she was still Bruce, petting Kendall as a toddler.
She also posted a snap of Caitlyn, surrounded by her two daughters.
Kendall and Kylie recently greeted Caitlyn for her honesty with them â??on sexualityâ?.
Caitlyn told people that if one of them "had a problem, she wouldn't have done it."
Kendall said: â??When my dad came out as transgender, our relationship grew.
"She could finally be honest with me. We could talk about the deep emotions she felt during that time."
Kylie added that her father has always been an "inspiration" to her.
Meanwhile, Caitlyn does not regret the transition.
â??When I wake up in the morning, Iâ??m happy with myself,â? she added.
Caitlyn also has children Burt and Cassandra, with ex-wife Chrystie Jenner and Brody and Brandon, with ex-wife Linda Thompson.