I'm not my brother's keeper

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I'm not my brother's keeper

I'm not responsible for the actions, behavior, or whereabouts of my close relative or friend (not necessarily a brother). Often used to express frustration that such responsibility is assumed. Of course I'm disappointed that Travis got arrested again, but I'm not my brother's keeper. How should I know where Mary is? I'm not my brother's keeper.
See also: keeper, not

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.
See also: keeper, not