 Dawes, a member of the prominent Dawes family of Massachusetts Bay, was a cousin of the April 1775 Whig patriot William Dawes.He married Hannah Blake on July 1, 1752.Their son Thomas Dawes (July 8, 1757 – July 21, 1825) was a jurist and an alumnus of Harvard University, graduating in 1777, and served in the Massachusetts Supreme Judicial Court from 1792 to 1802; he married Margaret Greenleaf.