VIDEO : Khloe Kardashian Tells Caitlyn Jenner She Misses Her Dad Bruce

In a promo for Sunday's Keeping Up with the Kardashians, Khloe Kardashian and Caitlyn Jenner sit down to discuss why they haven't really been in touch over the past year. Caitlyn asks Khloe what went wrong in their relationship, telling her, "I just really feel like over the last year and a half we certainly have grown apart." The 67-year-old goes on to say, "Day after day, month after month, nobody calls, nobody checks in." Khloe confides that Caitlyn's transition from Bruce to Caitlyn was difficult for her. She says, "My second dad, this guy that I've grown up with, that raised me, was taken away from me."