Been so long since I read this part. cmiiw, in the WN version, their children are different, right? Both boys, both girls, or was it Tetra who gave the daughter. And Almus realised before feeling like a father who had just got his first children, he think as a king who is relieved to have avoided risk of succession conflict.  But in this one, it's a big risk because Yuria failed to give a son. Almus have to give succession right to the Rocyce bloodline through Yuria. But there will be people who try to bring up Tetra's son by claiming legitimacy based on being the king's eldest son. She's so afraid of letting the old king hold her son.  The old king even reminds him to work hard and make Yuria give him a son, or in worst case he might have to force his children to marry each other to join the bloodline and avoid conflict.