I hope I'm lucky enough to get to do it one day. I'm only a teacher at the moment, not a mum.
I have 2 for sale...cheap
I have 3 - right now I'll pay you to take them! 
Seriously, though, I love my 3 boys, but they drive me nuts at home! The oldest, 11 today, is the bossiest child I've ever met! Of course, I always said that he was born with a 14 year old's mouth. Just like ya'll said, he's got his nose in everyone else's business, bossing the other 2 around. One more week & he goes to Scout camp for a week, then church camp for a week! The other 2, (9 yo & 6 yo) share a room & fight continually. I told dh that I feel like a ref for WWE! (which they are not allowed to watch!) Everyone says we'll all survive, but some days.... 
People, you're making me very, very scared. My children are only 2 1/2 and I already have days when I want to sell them on ebay and now you're telling me it's going to get worse 
? I think I'm going to go into a cormer now and cry ..... 
. Thanks for the insight into the future. Maybe this thread will still be here to console me 
Try making a chart. Every time he says something sassy or cops an attitude mark it down. After (5 or 10) marks, he owes you a chore or has to give up something like music, tv, computer, mp3, games. On the other side of the chart, mark down every time he does something exta nice for you or his brother. Give him some sort of reward for good behavior like a sleep over, a campout, etc. He will soon figure out that he wants the rewards more than the chores. Don't argue about what he does, just look him in the eye for either good or bad behavior and say something like "It's time for another mark".
Try "Love and Logic". It has done WONDERS for me. I can't remember the authors name, I took a class... but they also have "love and logic for teens". I am totally going to get it. 
I take care of a little boy who is 2. He was a terror until I started love and logic.
Try making a chart. Every time he says something sassy or cops an attitude mark it down. After (5 or 10) marks, he owes you a chore or has to give up something like music, tv, computer, mp3, games. On the other side of the chart, mark down every time he does something exta nice for you or his brother. Give him some sort of reward for good behavior like a sleep over, a campout, etc. He will soon figure out that he wants the rewards more than the chores. Don't argue about what he does, just look him in the eye for either good or bad behavior and say something like "It's time for another mark".
That might work, I'll have to try it.
This is pretty much how I dealt with my child who not only had an attitude, he was an only child and very, very intelligent. He knew how to manage working his father against me. I stuck to my guns and became the enforcer of rules. Then he decided he got more things for a positive behavior. It took a few weeks for him to figure out I was not backing down no matter what his father said. Eventually even his father saw the way things were suppose to work and supported me and that's all it took. Good Luck
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