Through most of high school, my son had to live through some trying times with his addict sister at home. Fortunately, he has always had strong support form family and friends and I think it helped him keep the chaos in perspective. A 9 yr old boy may not be able to sort out his feelings and articulate them well, but given time, he may be able to open up to a therapist/counselor who has gained his trust. Do you think journaling might help? My son used sports for an outlet and I think it really was a comfort for him to have his own group to bond with away from his family drama. I might add that he is nearly through college now and is a fine young man.