Virginia - that is the family I was talking about all along! I missed your saying that the Frederick who married Mary Goodrich was a son of ROBERT.
I said, in my second message, "There is a Frederick Briggs in Virginia, son of Thomas, born in 1744. It is said that he married Mary Goodwich in 1772. It is also said that he died in 1789 but I have seen no proof of his death."
This is great because the family of Thomas and Frances was the family I have been researching all along. So the Ancestry tree that gives Frederick, son of Thomas, the marriage to Mary is WRONG.