The ceasefire between Rob Kardashian and Blac Chyna may be coming to a halt as new reports say that Rob is pushing for primary custody of his three-year-old daughter Dream - and that Chyna is not fit to be the primary caregiver.

According to TMZ, Rob's sister, Khloe Kardashian, is backing up some of his claims in the court documents as well. Allegedly, in the court documents Khloe says she has noticed "behavioral change" in Dream and Rob says he also has also seen a dramatic change in the child's behavior.

Just months ago, the former couple was on better terms when they ended their lengthy court battle and agreed to share custody of Dream.  

At the time of the joint custody agreement, Rob even hopped onto social media to defend his baby mama against fans and critics of Blac Chyna.

 "Angela, the mother of my child whom I have a wonderful relationship with decided to drop the child support case because she felt it was in the best interest of our daughter," he tweeted.

Now it appears that something has happened to cause Rob to change his mind and the two are back in court battling over the custody of Dream.