AceShowbiz -

Is Rob Kardashian not the real father of Dream Renee Kardashian? The younger brother of Kim Kardashian has reportedly ordered a second DNA test to prove if Blac Chyna's second child is his daughter or not.

"He's got it in his head that Chyna faked the first paternity test," a family insider reveals, "She's said to him many times in anger that Dream's not his baby and even though she always backtracks later, saying she was trying to hurt him, Rob's literally been having nightmares about it."

"Blac's really messed his head up big time and he's not thinking straight. Deep down he knows Dream's his baby - she's the spitting image of him and his name's on the birth certificate - but it's Blac he doesn't trust," the insider tells Radar Online.

Rumor has it, Pilot Jones is Dream's real father. Based on the timing of Blac and Pilot's hookup, "it's possible" that he is the real dad of her baby daughter, not Rob.

"Pilot is telling friends that he will ask Chyna for a DNA test when the baby is born," a source shared, before the birth of Dream Renee Kardashian. "He deserves to know the truth. And if the baby turns out to be his, he will want to have a relationship with the child. That's actually very important to him," added the source.