In the article by the Globe, Ina Mapes says her grandmother, Laura Crawford, said her grandfather, Everett Reed, "had one-quarter tribal blood." Everett was the brother of Elizabeth Warren's grandfather, Harry Reed. Later in the article, Warren's brother says Harry Reed was "part Delaware, a little bitty bit, way back." Everett and Harry had the same parents, Joseph H. Reed and Charity Gorman. So how could one be a quarter Indian blood and the other be a little bitty bit?
If they were truly Indian, whatever parent that blood came through would most likely be identified as an Indian. The grandparent definitely would have. No matter what people like to claim today, full bloods and half bloods did not pass for white. It was not how one identified themselves, but how the community they lived in viewed them.
Indians did not exist in a vacuum. The blood would come through a continuous line of Indians, not just one. And at some time, those Indians that blood came through would have to be found living among their people. They would not be found in genealogical records listed as white going back to at least 1760, as the Reeds are. You can find their genealogy by going to Elizabeth Warren, who do you think you are? and Elizabeth Warren, Who Do You Think You Are - Part 2. Notice in Part 2, the aunt of Harry and Everett Reed writes a letter to her son, cousin to Harry and Everett, telling him his pa is afraid he will be exposed to the Indians.