In a clip from this Sunday's episode of Keeping Up With the Kardashians, the 29 -year-old reality star sits down with momager Kris Jenner, to talk about his strained relationship with his sisters after proposing to Blac Chyna.
"I get that you're in this new relationship, that's amazing for you," Kris explains. "But it doesn't mean that you can't still be close to all of us – that's how life works."
Rob then points out that it's hard to reach out and have a close bond with his sisters when they haven't been accepting of his romantic relationship with Chyna.
"No, I know, but you all aren't like that welcoming of this relationship, so you can't expect me to just be like, 'Oh, let's all hang out and everything's cool and fine,'" Rob says. "It's not that easy."
Kris then shifts the focus to Rob's relationship with Khloé Kardashian.
"I want you and Khloé to be OK and happy and connected. It's your sister," she points out. "You know, she's had a hard year and is going through a bad time with all the Lamar [Odom] stuff still, and she couldn't need her family more than she does now, and that includes you."
"If you made an effort just to kind of mend the feelings that are hurt and just try to get back on track with everyone, it would be so easy if you would just make the first move," Kris adds.
Watch the clip above to see who Rob decides to call first.
Keeping Up With the Kardashians airs Sundays at 9 p.m. ET on E!