Kendall Jenner is a bit jealous of younger sister Kylie Jenner–and it’s got nothing to do with boys or clothes, or any of the typical things sisters as close in age as these two might squabble over.

So why is Kendall Jenner jealous of Kylie?

During a preview of Sunday night’s episode of Keeping Up With the Kardashians, Kendall tells Kylie she’s envious of the time she spends with their dad, Caitlyn Jenner.

Kendall Jenner confesses she envies seeing Kylie and Caitlyn bond post-transition https://t.co/03YIRAbl4H pic.twitter.com/jjk7TDY2yF

— People Magazine (@people) January 14, 2016

“I miss doing stuff with Dad that like, we used to always do,” Kendall says. “Like the boyish things like dirt biking, and, I don’t know, adventurous things.”

Kendall Jenner wonders if Caitlyn and Kylie are so close because of the interests they share.

“I just feel like you guys bond so well because you’re super into makeup and I’m obviously not as into it as you,” Kendall tells Kylie.

Kylie has a suggestion.

“Maybe get your nails done together,” pointing toward Kendall’s unpainted nails. “You should just talk to her.”

“I don’t want to hurt her feelings, so don’t you think it’s better to not say anything?” Kendall asks.

“No. You should just have a little conversation,” Kylie replies.

Kendall Jenner claims she is happy that Caitlyn–formerly Bruce Jenner–is happy. She doesn’t want to do anything to indicate otherwise.

It certainly sounds like there needs to be a conversation between Caitlyn and Kendall Jenner. Caitlyn made it perfectly clear that she is still their dad, and that they can come to her with anything.

.@KendallJenner is jealous of @KylieJenner?! WATCH HERE! https://t.co/3683zsVWcK pic.twitter.com/YNnYtOdYoM

— Perez Hilton (@PerezHilton) January 14, 2016

Just because Caitlyn enjoys doing girly things with Kylie doesn’t mean she doesn’t want to spend time with Kendall, too.

Fans can watch Kendall Jenner admit her jealously to Kylie during Sunday’s episode of Keeping Up With the Kardashians. Tune in on E! at 9 p.m. ET.