The ownership of the gun is irrelevant as well, as are the pasts of the victims. IMO, this child had a very close and loving relationship with his father, which was interrupted or interfered with by the new wife. It seems to me that new rules and new discplines were introduced after the marriage. I believe his bio mom played on these changes and incited this little boy to a level he may not have reached on his own. An 8 year old is not capable of articulating to his father what he was feeling - IMO. That allowed his feelings to escalate to what amounts to murder. I'm really not sure that he can possibly understand the consequences of his actions.