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Definition of Nephew-in-law
1. Noun. Son-in-law of someone's brother. (''fraternal nephew-in-law'') ¹
2. Noun. Son-in-law of someone's brother-in-law. ¹
3. Noun. Son-in-law of someone's sister-in-law. ¹
4. Noun. ''Rare.'' Husband of someone's niece. (Usually called a ''nephew'') ¹
¹ Source: wiktionary.com