Kim Kardashian West Tells Caitlyn Jenner on 'I Am Cait' : 'This Is Your Time, but You Don't Have to Bash Us on Your Way Up'

Jenner's eight-part docuseries debuts Sunday on E!

Photo: Kevin Mazur/Getty

While Kim Kardashian West has been a strong source of support for Caitlyn Jenner throughout her transition, she’s not afraid to give some tough love when she deems it necessary.

In a season preview aired at the end of the premiere episode of Jenner’s docuseries I Am Cait, which PEOPLE viewed during a screening on Tuesday, there are hints of a potential Kardashian-Jenner storm brewing.

“You look amazing, it’s your time,” says stepdaughter Kardashian West, 34, to Jenner. “But you don’t have to bash us [Kardashians] on your way up.”

“I’m thinking about my family, and I’m thinking about all this type of stuff, and I’m struggling with it,” says Jenner before saying through tears: “I don’t want to hurt my kids.”

Earlier in the episode – which also revealed that youngest daughter Kylie Jenner met Caitlyn for the first time via FaceTime – all seemed to be well as Kardashian West brought husband Kanye West to meet a welcoming Jenner.

“I love his open-mindedness, and I love how he’s helped Kim come to grips with what’s going on,” Jenner said of the Yeezus rapper.

As for Kardashian West, she was particularly impressed with the 65-year-old’s figure.

“You look beautiful,” she told Jenner. “You know, the one thing I’m really shocked about is how skinny you are. You literally look like Kendall – like Kendall’s mom!”

RELATED: Kim Kardashian Reacts to Caitlyn Jenner’s Debut: ‘All We Could Really Ask for Is Kindness and We Felt That’

[BRIGHTCOVE “20927615” “” “peoplenow” “no” ]
The former Olympian and Kardashian West spend some time sifting through Jenner’s new wardrobe, where they jokingly conspired to set up Jenner and ex-wife Kris Jenner – who have the same Tom Ford dress – in a “Who Wore It Best?” showdown.

Seeing this playful new Caitlyn, who has herself acknowledged that she is more "free" since transitioning, we’re in for an interesting eight episodes ahead!

RELATED VIDEO: Caitlyn Jenner’s Message to Transgender Youth: ‘We Are All Beautiful’

I Am Cait

premieres Sunday at 8 p.m. on E!

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