Children Throwing Tantrums

[Amber_lv]

I have a 6 yr old who throws a fit when he is told no or when his baby brother plays with his toys i have tried everything to stop this behavior i have tried time out, threats, Stern talking, nice talking and even a swat on the butt and nothing seems to work on him. He is very smart and know how to manipulate already. What he does is he will start crying and screaming and it is so annoying like what a 2 yr old would do. I am on my last nerve with him does anyone have any suggestions?