Why is my father-in-law called Lord Taishan?

Usually we call the wife’s father father-in-law

(Of course there are other ways of saying it: “Lao Taishan”, “‘Taishan”, “Yuewen”, “father-in-law”).

This name originated from here -> Mount Tai, the allusion is as follows...

● Duan Chengshi of the Tang Dynasty recorded a story in "Youyang Zazu":

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In the 14th year of Kaiyuan (726 AD), Emperor Xuanzong of the Tang Dynasty, Li Longji went to Mount Tai to grant Zen. Prime Minister Zhang Yu served as the envoy to grant Zen, and by the way, he also brought his son-in-law Zheng Yi with him.

According to the old rules, after participating in the Zen ceremony with the emperor, officials below the prime minister can be promoted to one level. Zheng Yi was originally a ninth-rank official, but Zhang Shuo used his authority to promote him four levels to a fifth-rank official. At that time, the eighth- and ninth-rank officials wore light cyan or cyan official uniforms, and the fifth-rank officials wore light blue official uniforms. Emperor Xuanzong of the Tang Dynasty saw Zheng Yi's official uniform suddenly changed into a row of colors at a banquet. He felt strange and went to ask him. Zheng Mangan hesitated and couldn't answer.

At this time, Huang Banchuo, the court artist next to Xuanzong, replied on his behalf with a double entendre: "This is the power of Mount Tai!"

Xuanzong of the Tang Dynasty tacitly understood it, so he passed by. Later generations called his wife and father Mount Tai. Because Mount Tai is the "longest of the five mountains", the wife's father is also called "father-in-law", "Yue Weng", and "Yue Wen", and the wife's mother is also called "mother-in-law" or "Taishui".