I have been working on this line. Its a little confusing, but check out A History of the Seton Family for Eight Hundred Years and An Old Family. Check out Seton in Ancestry's card catalog. Adam is SErlo in one book and the son of Bartine, Bartholomew, Bertrand or Bertram Seton in the other. Bertrand married Margaret Comyn. He was the son of Alexander and Jean Barclay. Alex is the son of Philip and Helen Alicia. He is the son of Seher, Sayer Seton who is th eson of Dougal and Janet De Quincy, son of Saher De Seton who is the younger son of Robert according to some books. Earlier than that is goes Picot de Say from the Avenel family in France of from Saier De Say De Lens, son of Eustace of Flanders. I'm still figuring it out by reading the available information.