Kendall's rumored ex, Harry Styles, was guest hosting the show and the pair played a game of "Spill Your Guts or Fill Your Guts" with some telling results. Out of the gate, Kendall was asked to rank all of her siblings from best to worst parent in order to avoid drinking 1,000 year old egg-nog.
"I feel like I could answer it," Kendall says. "I feel like I could answer it," Harry quips in reply.
"I'll start by saying they're actually all amazing," Kendall insists to a disbelieving Harry.
"I'd say Rob [Kardashian] is number one," she said of her older brother who has a 3-year-old daughter, Dream, with Blac Chyna. "He's so good to his daughter."
As for the rest of her siblings, the 24-year-old model admits, "And then... that's so hard, they're all amazing."
After the 25-year-old musician tells her to drink the eggnog, Kendall finally gives in, ranking her siblings, "Khloe, Kim, Kylie, Kourtney," listing her eldest sister and mother of three as the worst parent of the bunch.
It's unknown how her siblings reacted to the ranking, but Kendall and Kylie did spend Tuesday evening together at a party, documenting it on their Instagram Stories.
Kourtney has recently decided to step back from her duties on Keeping Up With the Kardashians in favor of spending more time with her three kids.
"I just decided to spend more time as a mom and put more of my energy there," Kourtney recently told ET's Keltie Knight. "But I'm not saying goodbye. I think you'll have to see more of it on the new season, season 18. It isn't airing yet but it's being filmed."