Unfortunately we cannot yet answer why one sibling and not the other. Generally, primary caregivers react negatively to behaviours of children with ADHD, it becomes learnt that this is the only way to get attention. Have you considered using a reward chart? Sometimes by explaining what behaviour you would like to see and rewarding it when it is present, children modify their own way of behaving. Other children will react positively to physical rewards while others will prefer your time. It is important to teach him that the old way of doing things is no longer the way, by ignoring poor behaviours (difficult I know) he will soon give up on them.
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