Rob Kardashian's war with his family over his engagement to Blac Chyna ratcheted up to its most serious level yet after they all got in a huge battle of wills.
"The family tried to stage a kind of intervention, begging him to not marry her," an insider told RadarOnline.com.
While the sisters, including 27-year-old Chyna's arch-nemesis, Kylie Jenner, wanted him to dump his fiancée and future baby mama, others, like Kardashian's momager, Kris Jenner, were more pragmatic in their objections.
"Kris was going nuts over getting a prenup in place," said the insider, noting her insistence "only pushed Rob away."
The confrontation became so heated that Kardashian, 29, finally blew up and "threatened to get a restraining order against them all," claimed the insider.
The pronouncement has seemed to shut his family up — at least for now.
"It wasn't until he got legal on them that they realized they had no choice but to get on with it, which is one of the main reasons Rob's sister Kim bullied Kylie into publicly making peace with Blac," said the insider. "They went way too far and it all backfired.