I'm playing as the Lady of Deepdown. I've formed the High Lordship of Skagos, with my eldest son holding Driftwood Hall and a random vassal holding Kingshouse. My eldest son just became Lord Paramount of the Riverlands. I had expected him to inherit the High Lordship of Skagos as well, since he's my eldest and I'm using Primo succession laws. However, now that he's the Lord Paramount of the Riverlands, he's no longer me heir (his younger brother is). It shows that next in line is his youngest brother's legitimized bastard, so it looks like my eldest is completely out of the line of succession. What caused this? I was really hoping that when the Lady died, I'd start playing as Lord Paramount of the Riverlands as well as the High Lordship of Skagos.