Blac Chyna and Kylie Jenner seem to be at odds again.

According to Hollywood Life, Chyna and Rob are apparently in a potential custody war over their daughter Dream Kardashian, and since Kylie is allegedly supporting her brother 100 percent in the matter, Chyna's decided to cut off Kylie's play time with her son, King, whom she had with rapper Tyga.

"Chyna's surprised Kylie doesn't have her back in this situation," a source told the site. "They've become so close. They've put everything behind them and Chyna basically trusted her with King."

Kylie's decision to back her brother reportedly put a "bad taste in Chyna's mouth" and, according to the insider, she refuses to let the family take her kids from her.

"She doesn't think it's smart to have someone she can't trust and doesn't have her back be present in her son's life," the source added. "King and Dream are her babies and the Kardashians won't take them from her."

Get the rundown on Chyna and Rob in the BET Breaks video above.