Son-in-law (nǐXu), referred to as husband for short, refers to "daughter's husband", which can be found in Biography of Historical Records and Lisi by Sima Qian of Han Dynasty.
Pinyin nǐXu[ 1] attribute kinship terms
Detailed explanation (1) son-in-law: the daughter's husband.
Sima Qian, Emperor of the Han Dynasty, Biography of Li Si: Zhao Gaojiao's son-in-law Xianyang disintegrated Yan Le, and the thief killed someone and moved to the forest.
Tang Du Fu's poem "Li Jianzhai": The door is like a city, and the son-in-law is near Lapras.
Feng Ming magnum warns the world that Song Xiaoguan meets again and breaks the felt hat: Seeing that he is a talented person who can write and calculate, he must recruit such a son-in-law.
Qing Wenkang's Biography of Heroes of Children: After a day as a son-in-law, An Gongzi met such an inarticulate mother-in-law.
He has no intention of treating Xiangzi as an alternate son-in-law. -Lao She's Camel Xiangzi V
(2) Son-in-law (spoken dialect in parts of North China): husband.