Rob Kardashian was "saved" by Blac Chyna.
Rob Kardashian in 2013
The 'Keeping Up With The Kardashians' star's family was worried the 29-year-old star - who is expecting a baby with his fiancé - was "going to die" before he met the 28-year-old model.
A source told PEOPLE magazine: "Khloé had the most issues with the relationship. She found Chyna in her kitchen [when she started dating Rob] and didn't know what was going on. She felt very disrespected.
"The girls literally thought Rob was going to die. They feel like Chyna saved him. The [Kardashian sisters] have gotten over their issues with Chyna now. They've welcomed her in."
Meanwhile, it was previously revealed that Rob's family found out he'd got engaged online whilst they were holidaying in Vail, Colorado.
In scenes aired on Sunday night's (19.06.16) episode of 'Keeping Up With The Kardashians', Khloe said: "He proposed in front of her whole family. That's so f***ed up. Rob is such a p***y. I'm not going to cover for him anymore. What am I covering for him anymore for?"
With Kim adding: "I don't care if he tells me, I truly could care less."
However, Kourtney was more sympathetic to Rob, telling her sisters: "Maybe he thinks that you guys are judgmental because clearly you are ... That's exactly why he didn't tell you, because you're a b***h [Kim]."
Before adding to camera: "I think that Rob has his happy life with Chyna. But I just hope that it gets to the place where he wants to hang out with his family again."
And Khloe was so angry with what happened that she suggested Rob should be "cut" from the family.
Momager Kris Jenner said: "Did you see what she wrote about how we weren't invited to the wedding?"
Whilst Khloe fired back: "Rob's the weak link in the bunch, and needs to be cut."
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