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A step brother (not related by blood) should be called "beau-frère". The plural form is "beaux-frères". The name may be confusing for French speakers, as beau-frère is (also) the common name for a brother-in-law. If you notice that the relationship should be clarified, the best way is to call the step-brother: le fils de mon beau-père, le fils de ma belle-mère (my step-father'son /stepmother's son).

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12y ago

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