Kylie Jenner angry with her older brother Rob Kardashian dating Blac Chyna

Kylie Jenner, 18, was apparently not very happy to find out that he’s dating Tyga‘s ex-fiancee Blac Chyna, who is also mother to their son, King Cairo, 3.

“Kylie is livid,” a source People. “She feels super betrayed and can’t understand why someone in her own family would stab her in the back like that.”