For some of the Trump kids, lying was a way of life, and for Fred’s oldest son [Fred Jr.], lying was defensive – not simply a way to circumvent his father’s disapproval or to avoid punishment, as it was for the others, but a way to survive. For Donald, lying was primarily a mode of self-aggrandizement meant to convince other people he was better than he actually was.

– Mary Trump

Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man.