Noun
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| blood brother -
a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
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| blood brother -
a male with the same parents as someone else; "my brother still lives with our parents"
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brother |
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sis,
sister a female person who is a fellow member of a sorority or labor union or other group; "none of her sisters would betray her"
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male sibling a sibling who is male
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big brother an older brother
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little brother a younger brother; "my little brother just had his 50th birthday"
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