Roland knew the winds were always changing in the royal family because Benjamin almost took his place as crown prince and he had always been afraid that he would be the outcast of the Maximus family.
In fact, according to Sigrid's precognitive dream, Benjamin did become emperor although he gave up the throne after only a day.
Sigrid knew because Emmah and the queen had almost cost her the position she was working hard to keep. She had always expected to fight against Emmah but the queen had taken her by surprise. She had once time thought that they would be allies but things did not work out as she hoped.
Elarin knew of these winds because it had taken the murder of a royal consort and framing of a queen to put her where she was. Just like those two had come and gone, it was not impossible for the same thing to happen to her.
It was why she was not very troubled with the illness of the king and safely secure in the knowledge that she had a royal child that guaranteed her safety.