The tense trip marks the family's first vacation without Kourtney Kardashian's ex Scott Disick
Credit: Mike Coppola/Getty

There’s never a shortage of drama on Keeping Up with the Kardashians, and this season is no exception.

In a sneak peek at Sunday’s upcoming episode released by E!, tension between Kendall and Kylie Jenner mounts when Kylie decides to bring her boyfriend Tyga on the family’s St. Barths vacation.

In the teaser for the first half of the two-part episode, Kim Kardashian West announces that Kylie, 18, is planning on bringing Tyga on the trip – and Kendall, 20, is less than pleased.

“You could have taken this time to be with your family,” she tells her younger sister in the clip, which also features shots of Kylie and Tyga, 26, hugging and cuddling together.

This isn’t the first drama that’s gone down between the two youngest sisters this season: In a previous episode, Kendall called Kylie “the biggest f—ing bitch” when she wouldn’t let her borrow a dress, and another teaser for this season showed Kendall telling their dad Caitlyn Jenner that Kylie “doesn’t have her priorities straight.”

RELATED VIDEO: Kylie Jenner and Tyga Hold Hands at AMAs Afterparty Just Days After Source Said She Planned to ‘Erase Him from Her Memory’

And Tyga isn’t the only man creating a stir on the upcoming episode – the clip also teases some drama surrounding Kourtney Kardashian‘s ex Scott Disick.

Even though Disick, 32, wasn’t in St. Barths, the clip shows Kourtney, 36, scrolling through paparazzi pictures of her ex.

“Scott’s with two girls?” Khloé Kardashian can be heard saying.

“This is the first trip without Scott. He’s still causing a problem,” Kim, 35, says in an on-camera interview. “I just hope it doesn’t ruin the trip.”

“It’s going to be a long week,” adds mom Kris Jenner.

Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!