Following is the information I have on the parents and siblings of Thomas R. Briggs, and of his wife Sarah.
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Thomas Briggs' family

George Ambrose Briggs
b. Jul 10, 1794
d. Oct 16, 1881
m. Lydia Spencer (b. Jun 23, 1800)
m. Feb 16, 1817 in East Greenwich, Kent, RI
c. THOMAS RICE Briggs b. Dec 30, 1826
Susan Briggs b. 1831
Sybil Dean Briggs b. Sep 11, 1819
William L. Briggs
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Sarah's family

William Devoll
b. Jul 25, 1786 in Tiverton, Newport, RI
m. Patience Waite (b. May 13, 1788 in Tiverton)
c. Sarah Devoll b. Aug 1, 1824