The fourth time, the Monkey King was called the Great Sage of Qi Tian, and Niu Wangmo was called the Great Sage of Ping Tian.
The forty-first time, I wrote that the Monkey King said this to Hong Haier: "When I was not busy in the Heavenly Palace, I traveled all over the ends of the earth and four continents. At that time, I devoted myself to the hero. Your father's name is Niu Wangmo, and his name is Hirata Tiansheng. He and my grandson became seven brothers, and let him be the big brother.
In this way, Niu is the Monkey King's brother, and Hong Haier's mother, Princess Tiefan, is the Monkey King's sister-in-law.
The Monkey King is the brother-in-law of Princess Tiefan. In ancient times, women called their husbands' brothers and sisters from the perspective of their children, and called their brothers-in-law uncles.