The former Los Angeles Lakers star worked to reunite the siblings on Sunday's new episode of Keeping Up With the Kardashians
. While hanging out with Rob, Lamar encouraged the 29-year-old reality star to reach out to his estranged sister.
"Whenever I talk to her it just leads to crazy [fighting]," Rob admitted. "Her and I yelling at each other. No matter what."
"Seriously though, you should talk to your sister. I mean, time goes by so fast," Lamar said, speaking from experience.
Rob heeded his friend's meaningful words at the time, but Lamar made sure the siblings came together to hash out their beef when he brought the youngest Kardashian sibling to Khloe's house and surprised her in her private movie room.
"This is kind of awkward just having Rob and Lamar like walk in the theater like nothing has happened," Khloe admitted.
While things were tense between the three of them, Lamar tried to push the reconciliation forward, asking his ex, "Do you wanna go out with Rob soon? To dinner, [with] Blac Chyna?"
"No, that's not part of the plan," Khloe said, shooting the idea down immediately. "It's not [going to be with] Blac Chyna too."
"I need to talk to Rob first," the 32-year-old reality star told the KUWTK cameras. "Rob and I just need to have a private conversation and just have a talk and let's hash things out so we can just move on and get out of this awkward space."
Pushing forward, Rob continued to work on getting her to have dinner. "No, but seriously, we should all do something," he suggested.
"Yes, Rob. I would love to do that with the two of you," Khloe replied sarcastically.
"Or maybe just the two of us," Rob said. "I get it, it's cool."