I would also separate the siblings. Your son needs to feel safe at home, but this is your job .I would talk to your son and let him go to another room if needed. The other children need to be taught to be kind. Either a "good chart" with rewards for days they are nice ,or timeouts when not. Also I had a running space outdoors where they were timed on their speed or endurance. Sometimes they need more physical activity and goals.

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