Why is it called father-in-law Taishan instead of Mount Everest?

On the way to school, Ba Jin talked about a section of oral communication in a Chinese textbook, saying that a child would go to his grandparents' home after learning from them. The two old people couldn't accept this, and the children wondered: Am I wrong? Dad explained to his son: grandparents are written language, which is not suitable for ordinary daily conversation. My son is relieved.

I'm also sure that your father called me father-in-law, Lao Taishan, a more formal title.

Call dad now.

Yeah, that's what life calls it.

Here are the answers I found:

The origin of Taishan's name

This is a big problem! ! At present, there are many solutions, only two are chosen, and I agree with the first one. First, it is taken from the Book of Changes.

Both hexagrams and Thai hexagrams are very auspicious, and the orientation is just in the east, so they are named Taishan.

. Interested friends can look at Zhouyi. 2. Mount Tai was formerly known as Mount Tai, which means Dashan. It used to be too big, and sometimes it was universal.

The origin of my father-in-law, Lao Taishan, is related to the meditation of Taishan.

According to Volume 12 of Youyang Miscellaneous Language in the Tang Dynasty, Emperor Xuanzong of the Tang Dynasty went to Mount Tai to meditate in the fourth year of Kaiyuan (726). Prime Minister Zhang said that he was appointed as the envoy of Zen Buddhism and took his son-in-law Zheng Yi with him. According to the old practice, officials below the prime minister can be promoted to the next level as long as they are lucky enough to participate in meditation with the emperor. Zheng Yi was originally a do officer. Zhang said that he used his power to promote him to the fourth grade at once. At the banquet, Emperor Xuanzong of the Tang Dynasty was surprised to see Zheng Yi suddenly put on the light scarlet official uniform worn by the five-product official, so he went to ask him. Zheng Yi prevaricated, difficult to reply. At this time, Huang Zanzhuo, a court artist who is good at irony, answered for him: This is the power of Mount Tai! Pun intended, Tang Xuanzong tacitly, things just passed. Later generations therefore called his wife and father Mount Tai.

Because Mount Tai, also known as Dongyue, is the leader of the five mountains, he turned to call his wife and father Yue, Yue Weng, father-in-law, and so on. According to documents, this title began in the Song Dynasty. Wife and mother are called mother-in-law, and in written literature, they are later called Taishui.

It can be seen that the appearance of Taishan appellation comes from the connection of political interests in kinship.