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Khloe Kardashian is missing her brother.

On this Sunday's Keeping Up With the Kardashians, the family heads to Vail for a ski trip but Rob Kardashian decides to skip the vacation.

While Khloe says that this has been "one of the best" trips, she "can't stop thinking about" Rob.

"So far this trip has been one of the best, like Kendall and Kylie are finally getting to experience Vail, a place that means so much to me and my sisters," Khloe says in the clip above. "Kourt and Tyga have made up, we are playing such fun games, just spending really great quality time."

Khloe Kardashian, Rob Kardashian

Getty Images; E!

She continues, "But I can't stop thinking about my brother, he's the one piece of this puzzle that's missing and I really wish he was here because he would love this trip."

Take a look at the video above to see Khloe talk about Rob and to see the family play a "raunchy" game of Cards Against Humanity!

Watch brand new episodes of Keeping Up With The Kardashians Sunday at 9e|6p, only on E!