violence in 9 year old boy

[zobistar]

Hello
I am writing about my stepson who is 9. He is a very intelligent boy and has always been treated like an adult rather than a child of his age by those around him. He has been allowed to play alot of computer games that are not , i feel, suitable for him even though he is not allowed to play anything over a 12 rating.
The reason i am writing is that in the past couple of years he has developed some behaviour that has been noticed by his teachers at school but nothing has been done by his parents. He has always been the sort of little boy that was interested in guns and playing war but his behaviour has taken a worrying turn. I have two small girls and i dont feel like they are safe with him at the weekends.
The first instance of this behavious happened about 18 months ago. He was found with his younger brother who is about 4 now playing what they called the "willy game". This involved them trying to put their wilies up the others bottom. This was all very much brushed aside as he was "embarrassed" about this.
He has recently been drawing very violent pictures at school which caused the teachers to call his mother up the school to discuss them as they were concerned. His mothers answer to this was to tell him not to draw these things at school.
I have since learnt that when the children were asked to stand up and tell the class what they wanted to be when they grew up he stood up and told everyone that he wanted to be a serial killer.
I have discussed this with his father, my partner and father to my girls. He however immediately becomes defensive and tells me that i am being dramatic and that there is nothing wrong and that this behaviour is just "boys being boys". I have an older brother and nephews and no one that i have spoken to about this sees this as normal boys behaviour. In fact his own aunt thinks that this is worrying and is scared of him.

[Kevin Kennedy, Ph.D.]

It is certainly reasonable to assert that he is at risk for aggressive behavior directed toward others.

[zobistar]

Thank you for your advice. I understand that you cannot give a definative answer to this but would you consider him to be athreat to my children or other children around him?
Thank you

[Kevin Kennedy, Ph.D.]

The behaviors, both the sexual behavior and the violent ideation, are not within the normal spectrum and are signs of an emotional disorder. His parents would be prudent to arrange an evaluation by a pediatric mental health professional.