Tacy Hubbard (Cooper) - Question about her parents Thomas Cooper and Mary Raynor.

Tacy's mother is Mary Cooper, daughter of Edward Raynor.

Mary's brother was Thurston Raynor, of Elmsett & Southold. And Mary had a son (Tacy's brother) named Thomas Cooper.

So without looking at any other sources (which we need to do!), my guess is that Thurston had another daughter, who we're not currently showing, named Mary, and that this younger Mary married her cousin Thomas, the elder Mary's son.

Our friend Erica shows this on Thomas' profile: "Born to him during his 2nd marriage, to Martha (WOOD) were: Mary, Abigail, Deborah, Hannah, and Jonathan."

So that's probably it, though I don't have time to dig through sources at the moment.