Good luck battling the momager in court, Chy!

Kris Jenner has vowed to help son Rob fight Blac Chyna for shared custody of their daughter Dream, as the former couple try to figure out their co-parenting strategy.

"Rob wants dual custody of their child and Blac Chyna is giving pushback. They are still figuring things out but she will certainly do whatever it takes to have Dream be with her for the majority of the time. Kris [Jenner] is backing Rob up 100 percent and won’t let Chyna get away with anything that’s less than fair," a source dished to People.

"The entire Kardashian family is there for Rob as well and supports him wholeheartedly. They are prepared to protect him in whatever way they need to," the source added.

Did anyone think this wasn't her plan the whole time?! Even worse, the video vixen has been committing all the family secrets to memory, and plans to use them against the K clan if they don't give her what she wants!

“She has evidence of him partying around [their baby, Dream], calling her names and grappling her when they’ve gotten into fights. Chyna’s got the proof! She doesn’t think Rob can ever get his s**t together. She has told him he cannot be alone with the baby. She doesn’t trust him," a source dished to Radar.

We bet he wishes he never got involved with this chick!