Mary Trump, daughter of the President’s oldest brother, has reportedly been writing a tell-all book that exposes family secrets, including that she was a primary source for the 2018 Pulitzer Prize-winning New York Times investigation into Donald Trump’s taxes. In 2000, Donald Trump and his siblings retaliated against Mary for contesting her father’s will by cutting off medical insurance to her side of the family just after Mary’s nephew was diagnosed with cerebral palsy.