"Ma belle-sœur est la sœur de mon mari."
Translation:My sister-in-law is my husband's sister.
Why is "belle-soeur" sister in law? It seems more like "beautiful sister". I'm confused
You would say it as it is written at the top of this page. That's the best translation I see above.
Could belle-soeur also mean "step-sister"? I was wondering this since "belle-mère" and "belle-père" both translate to "step-mother" and "step-father."