Fics like About yifu and yizi [Nonfiction]

Yifu and yizi are quite common in Chinese novels and tv-series: Zhao Jing and Xie Wang from Word of Honor, Gu Yun and Li Changgeng from Sha Po Lang, Xu Shuanglin and Ye Wangxi, Jiang Xi and his unnamed "son" from 2ha... What do the terms "yifu" and "yizi" mean? And what kind of a relation is it?

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