In Too Much and Never Enough, Donald Trump's niece and licensed clinical psychologist Mary L. Trump details what it was like to be raised in the Trump family, and how her uncle's upbringing shaped the man he would one day become.

When Mary Trump was a child, she saw nothing unusual about her grandfather Fred Trump, or her aloof and audacious uncle Donald.

But watching her father Freddy, Fred's oldest son and heir apparent to his real estate fortune, fall apart before her eyes made Mary realize just how cruel and toxic her family environment was.

Mary L. Trump is a clinical psychologist and life coach whose progressive views have often put her at odds with her famous family.

In Too Much and Never Enough, Mary Trump outlines the psychological dynamics woven into her family's history, and how they molded her uncle into the man - and president - he would go on to become.

The book provides an unsparing portrait of the Trumps - so much that the family unsuccessfully sued to block its publication.

Now, the 45th president's legacy can be examined through the lens of the family that built him.