So think about it, by the time the story is happening, the Starks, the Tullys, the Arryns, the Baratheons, and the Martells are reduced to single threads. The Starks are all descendent from Rickard with only Ned's kids carrying the line, the Tully's are all descendent from Hoster's parents with only Edmure carrying the line, the Baratheons are all descendants from Steffon presuming Hurbard, the guy Stannis mentioned once, didn't carry on his line and so on. Only the Lannisters and the Tyrells se