Bruce Jenner‘s children are all handling his transition in different ways, and even Kim Kardashian West, who Jenner called the “most accepting,” has her moments of difficulty with the situation.

In a newly released clip from E!’s upcoming Keeping Up with the Kardashians: About Bruce two-part special, Kim fights back tears as she talks to half-sisters Kendall Jenner and Kylie Jenner about their father’s journey.

“He’s gonna tell his full story, at first I was like I was ‘I’m totally gonna cry, I’m totally gonna cry,’ ” Kim tells her sisters of talking to Bruce about his 20/20interview with Diane Sawyer last month.

“I was thinking, ‘Mom this is really hard for her.’ It’s so sad. She cries all the time and it makes me really sad,” Kim, 34, said in the sneak peek, wiping away tears. “We should really appreciate all the things she does for us, because she does a lot.”

In an earlier promo, Bruce spoke sweetly about his ex-wife Kris Jenner, and seemed grateful for her understanding.

“You know, Kris is a really good woman, and I love her to death,” said Bruce, 65. “And the love and acceptance I have gotten from Kris is absolutely overwhelming.”

Part One of Keeping Up with the Kardashians: About Bruce at 9 p.m. ET on E! Part Two will air at 9 p.m. ET on Monday.

Editor’s note: Per Bruce Jenner’s request, PEOPLE will continue to use male pronouns until otherwise instructed.

This article originally appeared on People.com

Contact us at editors@time.com.

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