I am also a survivor of suicide. It was 27 years ago and I don't understand it any better now then I did then. I do know though that time heals all wounds. Children have a way of blocking out the emotions of a traumatic event. I hope your nephew gets counseling as soon as possible. If he deals with his grief now, it will save heartache later. There are also groups for survivors of suicide that would help you, along with al-anon. As far as anger goes, I am still angry and probably always will be. The pain has turned into a mild sadness now, but I remember when it was overwhelming. The "I should have" and "I could have" and "if onlys I had" drove me crazy. Now I think "he should have" and "he could have" and "if only he had" and look what an impact his choice made on my children's lives. They have suffered greatly feeling that their father didn't care enough about them to stay alive. I am sorry for the pain you are experiencing. It will get better.
Morning Glory