Mom2MrQ: Tx for the perspective. I don't really think he was being a know-it-all, but that was the only way I could think of to get my point across. You have some great advice. I'll try that next time (as I'm sure there WILL be a next time).

JJsmom: I have the SAME problem with DS when he's wrong. He just INSISTS that he's right, even when I prove to him otherwise. By the next day, though, he often reverts to what I proved to him and we're over the hump. It's too bad you don't live close by. I suspect our kids would either love each other or happily constantly argue with each other! ;-)