Khloe Kardashian and Lamar Odom Warn Rob About Marrying Blac Chyna: 'Marriage Ain't Easy'

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If anyone knows the difficulties of making a marriage work, it's Khloé Kardashian and Lamar Odom.

In a clip from Sunday's episode of Keeping Up With the Kardashians -- a clip that is very reminiscent of their defunct spin-off, Khloé & Lamar -- the estranged couple discusses Rob Kardashian's engagement to Blac Chyna and Lamar warns, "Marriage ain't easy, honey child."

WATCH: Khloe Kardashian Reacts to Kylie Jenner and Blac Chyna Making Peace: 'You're a Beast'

Lamar would know -- the reality show will tackle his own divorce from Khloé in upcoming episodes, now that she's filed for the second time.

As for Rob's upcoming nuptials, he remains vague on wedding details -- "I don't know how soon. But first comes love, then comes marriage, you know." Instead, KUWTK focuses on Khloé's relationship -- or lack thereof -- with her brother.

"Rob has disconnected himself from us, apparently mainly me. He doesn't talk to me. I hear he talks to my sisters way more," she explains as Lamar and Rob make plans to get dinner over FaceTime.

"I have always loved Lamar and Rob's relationship and bond, and I want them to hang out," Khloé says. "But you know, I still want my time with Rob. He hasn't had any one-on-one time with me. Rob hasn't attempted to do anything with me."

It seems the siblings have since reconciled, as Rob and his bride-to-be stepped out for Khloé's birthday party last month. Chyna and Khloé even snapped some selfies together -- check them out in the video below!