In 2000, Dr. Cahn married Christine Gray. Besides his wife, of Washington, survivors include two sons from his first marriage, Jonathan Cahn, of Bethesda, and Reuben Camper Cahn, of Capistrano Beach, Calif.; two stepchildren, Crispin Vicars and Antoinette Vicars, both of London; his twin sister; five grandchildren; and two great-grandchildren.
