A Vizier has two sons: Shams al-Din Mohammed and Nur al-Din. When their father dies, they take turns being Vizier. They propose to marry two sisters on the same day so that Shams al-Din will have a daughter and Nur al-Din will have a son. Their hypothetical children will then be married, but the two brothers argue over a dowry price and part ways. As it happens, they get married on the same day, and Shams al-Din has a daughter and Nur al-Din has a son, Badr al-Din Hasan.