Caroline's birth and marriage information are available on page 279 (section 295) of 'The Brewster Genealogy, 1566-1907. Compiled and edited by Emma C. Brewster Jones. Volume I. New York: The Grafton Press, 1907. Available online at https://www.google.com/books/edition/The_Brewster_Genealogy_1566_19...
Caroline and Sydney were married on 26 November 1857.