His half-brother was Col. Thomas Goldthwait, commander at Fort Pownall (1763–1775). Thomas Goldthwait - was he a Tory. Collections of the Maine Historical society, p. 23 (includes Goldthwait portrait p. 1) His brother, Ezekiel Goldthwait, was a prominent businessman in Boston with loyalist feelings, but who was also one of those who engaged lawyer James Otis, Jr. to challenge the British in the writs of assistance case of 1761.Sabine, Lorenzo. The American Loyalists, pp 328-9, Charles C. Little and James Brown, Boston, Massachusetts, 1847.Smith, M. H. The Writs of Assistance Case, pp 29-34, University of California Press, Berkeley, California, 1978. .Miller, John C. Origins of the American Revolution, pp 46-7, Little, Brown & Company, Boston, Massachusetts, 1943.
