After the queen and consorts were introduced then came the princes and princesses. The king had not yet chosen a crown prince but as per the notes recorded by the previous branch chief, it seemed like the king was leaning more toward the surviving twin, the child he had with the queen.
However, though the king supposedly was leaning towards him as his next heir to the throne, his mother was a former commoner with no background whatsoever other than her accolades as a general of the kingdom.
If he were to become the king, the five peak aristocratic families would constantly hinder him at every turn and would even go to the extent of interfering with his inauguration. All that prince had for backing was his mother's reputation and the Zhou royal family but even then, from the notes Yang Qing read it wasn't all in the Zhou family who supported him.