Kim and Khloe Kardashian Say Brother Rob Has "No Loyalty" to Their Family

Rob Kardashian's relationship with Blac Chyna--the baby mama of Kylie Jenner's boyfriend Tyga--has certainly put a strain on his family dynamics. Now that Jenner and Chyna allegedly made up, things appear less volatile. However, when E! filmed this season of Keeping Up with the Kardashians, it was a completely different story. In fact, there was a time when his sisters Kim and Khloe thought he gave no f-cks about the family at all. And E! caught the girls saying that.

In this sneak-peek clip of the upcoming KUWTK episode, KhloKhlo and Kimmy discuss their brother's recent resurgence into the public eye after years of seclusion. They credit Chyna for bringing their brother--who is currently slimming down after gaining 100 pounds--back to life. Even still, that doesn't excuse him for keeping them in the dark about Chyna.

"If she gave him confidence, more power to her," Kanye West's boo said. "My thing is--do what you want! Do what makes you happy. Whatever. But he should have said to us, 'Hey guys, this is how I feel. I can't help who I love. I fell in love with her, but Kylie should know this."

The Selfish author added, "He just has no loyalty."

Her little sis agreed. "He has no loyalty," she said.

But make no mistake: The girls are happy their little bro is finding himself again. They just don't appreciate all the secrecy. "Am I happy he's out in about? For sure," the Strong Looks Better Naked writer said. "Am I disappointed that Rob isn't talking to me after he got out of my house? Yeah."

Watch the drama unfold in the video above, and tune in Sunday on E! for a new episode.

VH1 staffers bring Jenner and Tyga's relationship timeline to life in the following video: