Some things you should look into our is there lack of parenting at home, does the child seem different then the other children like he may be special needs such as ADHD, SPD, etc.. Talk to the parents about his behavior DAILY they need to know what their Son is doing so they can address this with him at home also. Also does his behavior seem normal of what a 2 year old does or does it seem more aggressive? If time out isnt working and it doesnt sound like it is you have to find what will work such as telling him if he misbehaves today he has to sit with you when you go outside to play, go to the park, etc. you have to find what bother him the most as that will sink in more.

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