My 3 years old son has become very stubborn...doesn't listens to me or his dad unless we shout at him. We tell him don't do he will do it and show. How do I explain to him?

You have to handle him with patience, discipline, and love, yes a balance of this three. Generally by this age kids realize that they are individuals who have their say and opinion in everything. Talk to him, tell him stories of how good children don't behave in such a manner. Don't give in to all his demands and tantrums. Stop talking to him for a while when he is behaving badly. Be consistent in your own behavior. Eventually things will fall in place.