Rob Kardashian, you have some explaining to do!
"If this was any man that we were with we would be pissed," Khloe says. "He hasn't spoken to her in days."
"Why?" Kourtney asks.
Getty Images; E!
"I don't give a f--k!" Khloe replies. "You still need to check on her."
Khloe continues, "I don't care if it's our brother, facts are facts, it's crazy how he's acting. That's so f--ked up!"
Take a look at the clip above to see the trio sound off on Rob and find out what Kim says when asked what she would do if Kanye West ever disappeared on her!
Keeping Up With the Kardashians on Mondays at 9:30PM, only on E! in Australia