Brother-in-law
//ˈbɹʌðɚ ɪn ˌlɔ//
Word Forms of "brother-in-law" (4 forms)
Noun
| Form | Word | |
|---|---|---|
| Alternative | brother in law | |
| Archaic, Plural | brethren-in-law | |
| Colloquial, Nonstandard, Plural | brother-in-laws | |
| Plural | brothers-in-law |
Alternativebrother in law
Archaic, Pluralbrethren-in-law
Colloquial, Nonstandard, Pluralbrother-in-laws
Pluralbrothers-in-law
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.