Your brothers and sisters, or children who share the same parents.
From Latin 'sibling' meaning blood relative, from Old English 'sib' meaning family or kinship. The '-ling' suffix was added to create the modern term for brother or sister relationships.
The word 'sibling' only became common in the 1900s—before that, people just said 'brother' or 'sister.' Scientists love this word because it lets them talk about family relationships without knowing someone's gender.
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