Jisho

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Noun
1. son-in-law taken (adopted) into family
Wikipedia definition
2. MukoyōshiA mukoyōshi (literally "adopted son-in-law") is a man who is adopted into a family as a daughter's husband, and who takes the family's surname. This is done to preserve the name and occupation of the family when there is no suitable male heir. Usually, when there is an unwed daughter of a suitable age, she will marry the mukoyōshi, but if there is no daughter, the candidate can take a bride from outside his adopted family (Fufu-yōshi).
Read “Mukoyōshi” on English Wikipedia
Read “婿養子” on Japanese Wikipedia
Read “Mukoyōshi” on DBpedia
Other forms
ムコ養子 【ムコようし】

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