It is definitely A. Robert's middle name was Anderson. His wife was Sarah Ann Tate. If you follow the census information, it is tough to get much further back than Robert because prior to 1850 you lose all the individual family members. Robert and Sarah had a bunch of kids (16) and two of their grandsons Henry Robert Thacker and Benjamin Franklin Thacker married two of the my grandfather Wallace Tate's sisters. They actually eloped together (the four of them). I have John's wife as Betsy Mary Lewis b. 1787.
One of Robert and Sarah's daughters Mary Elizabeth Thacker was one of my great grandmothers. I have an entire chapter in a book about my other maternal great grandmother (Hettie Gilbert Edwards) because of the degree of entanglement of these two families.