According to data given to us, by my husband's deceased aunt... We have Sarah Steward m. to Thomas Abbott Jr.Info is from his will Ipswich, Mass, Ct. Rec. Mar. 16, 1654page 41.is her cited source.I have not verified this information. She also has the same date of marriage as you stated...15 Dec. 1664. Maybe this will help you sort it out. I personally get confused by the various Thomas Abbott's. Good Luck.