My sister also committed suicide she was 16 years old at the time. I think my family wasn't going to tell me, but they did, of which i am so glad now, i felt left out in the cold like there was something i should know. They told me first she took pills, but i found out how she really did it, she hung herself. I think you should tell your son, he may find out anyway and be angry no one told him the truth.