Co-brother-in-law meaning

(uncommon) One's brother-in-law or sister-in-law's brother; that is, one's sibling's spouse's brother (one's sister's husband's brother or one's brother's wife's brother).
  • (in the plural) Men whose brother and sister are married to each other.
noun
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(uncommon) One's wife's sister's husband; or more generally one's spouse's brother-in-law, the brother of one spouse in relation to the siblings of the other spouse.
  • (uncommon, in the plural) Men who marry sisters.
noun
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Origin of co-brother-in-law