WATCH: Kylie Jenner Is Sick of Being Bossed Around by Kourtney Kardashian

Kylie Jenner would like everyone to know that she’s all grown up.

In a new preview clip for an upcoming episode of Keeping Up With the Kardashians, the 18-year-old is displeased when older sister Kourtney Kardashian hijacks her plans for a housewarming party at her newly renovated $2.7 million mansion. Though Jenner hopes to have a simple soirée, Kardashian, 36, wants an all-out bash complete with a giant waterslide to the pool.

When Kardashian suggest that Jenner should keep her dogs out of the house and give greyhounds Norman and Bambi “a vacation for a day,” that’s when the teen star draws the line.

“I don’t know how many time I have to say ‘I’m grown now. I’m 18. I can handle this on my own,'” Jenner says. “Sometimes with my family, it’s just easier to nod your head and brush things off your shoulder.”

We’ll say! Previously, Kim Kardashian also confessed to bossing her younger sisters around.

She told the Editorialist magazine, “It’s so funny, because I’ll hear stories like, ‘Kris Jenner is the puppet master, having all of her kids do this and that,’ and I’m like, ‘If they only knew,’” she says. “I’m the one that will be like, Kylie, do this. Kendall [Jenner], you should do this.'”