foster brother

noun
a boy brought up with another child of different parents.

Origin:
before 1000; Middle English; Old English fōster brōthor

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He gets along great with his foster brother and sister.
Her foster brother then came to her aid and was also bludgeoned with the hammer.
But, on the advice of a foster brother, he joined the military.
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