Aidan's fahter was really happy when he returned. Also, whom he has lost all the money.

They have time to talk to each other like good father and son. They seem to understand each other well. Frederick tries to explain about the war to Stefan and Stefan doesn't argue against him.

Aidan's father is really kind to Aidan. But Aidan is not that kind. He spends his money for gambling and then is afraid to come back. Even when he returns, it's his father who runs to him!

Antonio and Peter has the worst relationship in my opinion. Peter insists Antonio to marry while Antonio persists in rejecting Luciana. Peter doesn't want to understand Antonio's feelings. Finally, even Antonio decides to resign from the throne so he can be with his love Rosella.