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general::
Phrase(s): I am not my brother’s keeper. [and] Am I my brother’s keeper? Prov. You are not responsible for another person’s doings or whereabouts. (Biblical.) • Fred: Where’s Robert? Jane: Am I my brother’s keeper? • Jill: How could you let Jane run off like that? Alan: I’m not my brother’s keeper.
McGrawhill's American Idioms And Phrasal Verbs