Mystery,
Sorry to hear of the sad news!!!!! I'm sure your son needs to know that he feels safe in THIS world, especially now. He is old enough that he must be realizing how fragile life is right now.
As far as where we go when we die, I thought one of the scientifically proven things, (Einstein I think) is that energy never truly dies, only gets transferred. I'm not highly educated myself but it would seem to me that some part of our energy must carry on. I can't say if it is a re-incarnation type thing or our soul going somewhere else, but I think that how we act in this present form has some sort of bearing on where we go next.
To me, even a hardened criminal, when they realize the error of their ways, believe that they are in a better spot when they are doing good things. The fact that everybody on earth seems to believe that they should at least try to be GOOD, must mean that it has something to do with where we go in our next calling.
My thoughts are with you and your son, Brad