Tensions were high on day four of the trial, with Kris, 66, giving a bombshell testimony on the stand during Thursday's courtroom session.
Kris recalled Kylie's then-boyfriend Tyga told her about the alleged death threat, and she also claimed Chyna tried to attack him with a knife. (Tyga and Chyna previously dated and share 9-year-old son, King Cairo.)
"Of course it was alarming but we just kept it in the family," Kris told the courtroom, according to the publication. "They lived across the street and [Chyna] had a young child. I think we were more concerned about the Tyga situation."
As reported by People, the model was questioned by the Kardashian-Jenner attorney, Michael Rhodes, who claimed Chyna was paid a $100,000 kill fee for the show and an additional $370,000 to appear on Keeping Up With the Kardashians.
But Chyna tried arguing that she was under the impression that the $100,000 was money for filming, not a kill fee.
"Why would I sign a kill fee for my number one show?" she asked, while alleging she was left out of her contract negotiations.
As for Rob, 35, the sock designer was noticeably absent from the trial once again, as reports claim he has been on dad duty with his and Chyna's 5-year-old daughter, Dream.
According to TMZ, Rob is trying to keep everything as normal for Dream as possible while her mom continues to duke it out with the Kardashian-Jenner squad in court.