Ebenezer R. Hoar, a first cousin of Evarts, was a U.S. Attorney General, Associate Justice of the Supreme Judicial Court of Massachusetts and representative in Congress. The two were best friends and shared similar professional pursuits and political beliefs. Each served, in succession, as United States Attorney General. Some of Evarts's other first cousins include U.S. Senator and Governor of Connecticut Roger Sherman Baldwin; U.S. Senator from Massachusetts (brother of Ebenezer R.) George F. Hoar; and Sherman Day, California state senator and founding trustee of the University of California.