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Thank you for writing back with your concerns.
Your son is still acting out his frustration and jealousy about the newly adopted son and he is seeking more attention by acting in this manner.
I have several suggestions.
Watch the DVD for a start.
Talk to his teachers to try to work together with you to find some techniques to calm him down.
When he needs to calm down show him how to take a time out on his own or direct him to take one.
He needs several minutes to calm himself down; let him take some deep breaths and think why he isr angry.
You must show him that he does not need to be controlled by his anger; rather he can be in control of it and stop it.
Let him talk about what is making him angry.
Encourage him to draw a picture of what is upsetting him and he may reveal what he cannot say in words.
Get him some emotion flash cards where he can show you how he is feeling. These really help to engage him. Here is one source:
Finaly, I have two more books for you:
Be patient and keep working with him.