Kim Kardashian has become the voice of reason in the transition of Bruce Jenner.

Jenner called Kardashian the "most accepting and easiest to talk to" of all the sisters about his sex change during his interview with Diane Sawyer, and Kardashian will try to impart that wisdom to her mother and Jenner's third ex-wife, Kris, in the two-part "Keeping Up with the Kardashians" special on E!

The episode will reveal the tough conversation Bruce had to have with his family about his transition, and Kris takes the news especially hard. In a first-look clip, Kris sits crying in her bed as Kim tries to explain how Bruce must feel every morning he wakes up as a man but feeling like a woman.

"He has to deal with this for his entire life, of waking up and feeling like, 'Whoa, this isn't my body. This doesn't feel comfortable,'" the 34-year-old Kim tells her mother. "That's the only way I can kind of imagine it. And you really have to, like, let go."

That will prove difficult for Kris, who was married to Bruce for 23 years and had his two youngest children, daughters Kendall, 19, and Kylie, 17.

"I have these memories of this life," the 59-year-old mother of six told Kim. "And I feel sometimes like it didn't exist."

The "Keeping Up with the Kardashians" two-part special will air on Sunday, May 17 and Monday, May 18 at 9 p.m. EDT. The episodes will include "intimate conversations that Bruce had with his family," as well as home videos of Bruce "as a father, husband and father," according to a press release from the show (via Us Weekly).