grieving and coping

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at some point in one's life, and at a very young life at that, we lose someone we feel especially close to, a very dear friend, a constant companion, and losing his life, saved a life and father and son. This happened to my nephew, and he is so down now, and he seems to be going into some depression. Grieving for him was so real painful. How does one advise him, that what happened is not his fault, that it was an accident? He blames himself for what happened.