Who was the President’s Brother, Robert Trump? Six Things to Know

He sued his niece to protect his brother

Gage Skidmore via (https://creativecommons.org/licenses/by-sa/2.0/deed.en) Wikipedia Commons

He proved it by filing a lawsuit against niece Mary L. Trump to block the publication of her inflammatory family tell-all “Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man.” He was unsuccessful at halting the memoir and the book went on to sell 1.35 million copies in the first week after publication.