Not true. In fact, he's always lied so much that one of his ghostwriters, Tony Schwartz, invented a definition for it while writing Art of the Deal.
Trump’s hyperbole isn’t always backed up with facts
Trump’s loose relationship with facts is well documented, all the way back to his bestselling book “The Art of the Deal” in 1987.
“People want to believe that something is the biggest and the greatest and the most spectacular,” the book said. “I call it truthful hyperbole. It’s an innocent form of exaggeration — and it’s a very effective form of promotion.”
Tony Schwartz, Trump’s ghost writer, has said that he coined the phrase “truthful hyperbole,” but the future president loved it.
I think he long ago lost track of the difference between truth and falsehood. Perhaps in childhood. But no Trump family members are particularly honest.