Usage Note
Stiefbruder is the son of one's stepparent from a previous relationship. Note the distinction from Halbbruder (half-brother, who shares one biological parent with you). Modern German families use both terms precisely.
Examples
"Sein Stiefbruder ist zwei Jahre älter und lebt in Hamburg."
Natural Translation
His stepbrother is two years older and lives in Hamburg.
Literal Translation
His step-brother is two years older and lives in Hamburg.
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