On 2 Aug 1764 when Sybil was 20, she married Charles Cook (44276) , son of Moses Cook (24602) (6 Nov 1716-12 Dec 1771) & Sarah Culver (42207) (30 Dec 1716-4 Jan 1760), in New Haven, CT. Born on 13 Jun 1741 in Wallingford, CT. Charles died on 20 Sep 1796; he was 55.