A sibling-in-law is the spouse of one's sibling, the sibling of one's spouse, or the spouse of one's spouse's sibling. In Indian English the latter can be referred to as a co-sibling (specifically a co-sister, for the wife of one's sibling-in-law, or co-brother, for the husband of one's sibling-in-law).
A sibling-in-law is the spouse of one's sibling, the sibling of one's spouse, or the spouse of one's spouse's sibling. In Indian English the latter can be referred to as a co-sibling (specifically a co-sister, for the wife of one's sibling-in-law, or co-brother, for the husband of one's sibling-in-law).
Source: Wikipedia "Sibling-in-law" · CC BY-SA 4.0
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