I've been playing as Eddard Stark for some while now, and just noticed that I had no firstborn son anymore! Somehow Robb changed his dynasty to Tully, and he is no longer my son (his characterpage only shows Catelyn as the mother, but he has no father). Is this some kind of mechanic or is it a bug? If relevant, Robert Baratheon just lost to a "Depose" faction (I sided with him), and his oldest living daughter (now empress) is bethrothed to Robb. :huh: