Hello, Margaret, I think there is a fair degree of validity to those claims. There are archeological digs in Brazil that far outdate the arrival of peoples over the land bridge from Asia. And DNA evidence, in the case of those sisters, is pretty hard to refute. I'd like to see more research done in this area, which has had archeologists baffled for ages (i.e. the great age of the materials found in Brazil.) This is the second piece I have seen on DC on this topic, which I believe we say on the Discovery Civilization or Discovery Science Channels. Ron