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Sibling-in-law is a gender-neutral term to refer to a brother-in-law or sister-in-law. A brother-in-law (plural ''brothers-in-law'') is the brother of one's spouse or the husband of one's sibling. A sister-in-law (plural ''sisters-in-law'') is the sister of one's spouse or the wife of one's sibling. Additionally, persons who have married siblings will refer to each other as "brother/sister-in-law" or "co-brother/sister-in-law" since each is the sibling-in-law of the other's spouse. ==See also== *Nephew and niece *Cousins-in-law *Affinity (law) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sibling-in-law」の詳細全文を読む スポンサード リンク
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