Plural of Brother-in-Law is
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Brother in Laws
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Brothers in Law
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Brother in Law
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Brothers in Laws
B
Correct answer
Explanation
The plural of 'brother-in-law' is 'brothers-in-law' - for compound nouns, only the main noun (brother) is pluralized, not the descriptive phrase (in-law). The same rule applies to mothers-in-law, fathers-in-law, etc.