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What is the opposite of sibling?

Need antonyms for sibling? Here's a list of opposite words from our thesaurus that you can use instead.

Noun
Opposite of one's family, blood relations, or lineage
Noun
Opposite of a male sibling
Noun
Opposite of a boy or man in relation to either or both of his parents
Noun
Opposite of a woman or girl in relation to other daughters and sons of her parents
Noun
Opposite of a person who is connected by blood or marriage
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