G.W.
It is perfectly normal for a child to go through the terrible twos at three and a half. The best advice I can offer is Dont get mad. When he acts up just give him a time out. Then talk to him about his behavior when the time out is over. It is also a good idea to give positive reinforcement when he is being well behaved. If you catch himdoing something good reward him with some quality time with you ,something like a gameor sitting down to color,something you can do together. when he sees he is not getting attention for bad behavior but is for good he will soon realize the best way to get attention.