I am not my brother's keeper Definition in the Cambridge English Dictionary
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Definition of “I am not my brother's keeper” - English Dictionary

Definition of "I am not my brother's keeper" - British English Dictionary

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I am not my brother's keeper

saying used as a way of saying that you are not ​responsible for what someone ​else does or for what ​happens to them
(Definition of I am not my brother's keeper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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