Sister-in-law

"Sister-in-law" in French

belle-sœur

(wife's sister)

belle-sœur

(husband's sister)

belle-sœur

(brother's wife)

belle-sœur

(wife's brother's wife)

belle-sœur

(husband's brother's wife)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.