Fictional Parent and Child

…When a person who does not have a parent-child relationship goes through a certain procedure and enters into a relationship similar to a parent-child relationship, it is generally called parent-child affiliation, and the relationship that is established by parent-child affiliation is generally called a provisional parent-child relationship, a parent-subordinate relationship, a fictitious parent-child relationship, a ceremonial parent-child relationship, etc. Also, the parent in this relationship is called a provisional parent. …

*Some of the terminology explanations that refer to "fictitious parent and child" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…親子関係にない者が一定の手続を経て親子関係に類似した関係をとり結ぶことを一般に親子成りといい，親子成りによって成立する関係を仮の親子関係，親分･子分関係，擬制的親子関係，儀礼的親子関係などと一般的によんでいる。また，この関係における親を仮親という。…

※「擬制的親子」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報