The entire Kardashian clan has been affected by Rob Kardashian and Blac Chyna's relationship drama.
In a sneak preview at Sunday's Keeping Up With the Kardashians, the sisters can be seen intervening with their brother about an argument he had with his then-fiancée.
"Rob and Chyna got into a big fight," Kim explains to the camera. "We're all worried about Rob."
The teaser then cuts to Kim, Khloe, Kourtney and Kylie on a FaceTime call with Rob regarding his on-again, off-again relationship. "She texts all your sisters and said that she's ready to leave you," Khloe tells her 30-year-old brother of Chyna, 28.
Rob responds by declaring his dedication to Chyna, much to his sisters' chagrin. "I definitely do love her and want to be with her," he says.
"Am I crazy? What does that mean?" a perplexed Khloe asks her sisters.
The Rob & Chyna stars split earlier this year and continue to co-parent their 5-month-old daughter, Dream. The pair appears to be amicable, however, as they were recently spotted cuddling on Snapchat, sparking rumors of a possible reconciliation.
Despite being chummy with her ex, Chyna was recently seen sans engagement ring while enjoying a night out with a mystery man, just one year after Rob's public marriage proposal.
For more on the up-and-down couple, watch the video below. Keeping Up With the Kardashians airs Sundays at 9 p.m. on E!.