First, I would say that it was a good thing that you did not fire. Virginia does not subscribe to the home castle doctrine... we have that 'duty to retreat' if possible thing. Since you say the kids were past you, I interpret that to mean they were already attempting to flee - signifying there was nothreat to your life. Had you fired and hit one of them, you may have found yourself being charged with malicious wounding, or worse since you would not be able to claim self-defense.
As to your direct question - I would hazard to say (I'm not a lawyer, but I did stay at a Holiday Inn Express last night...) that since you were on private property, possessing a weapon with the permission of the owner / resident... you do not fall under concealed carry restrictions in regards to alcohol. In fact, if youwere standing in the yard withyour sidearm in presentation mode, you weren't 'concealed' anyway at this point.
However -If you had fired and hit or possible killed one of the kids in their attempt to flee - and as a result were criminally charged - a Commonwealth's Attorney would likely make a big deal of out of your BAC level. Especially so, if you were found to be 'legally' intoxicated.
There's right, there's wrong, and then there's the fine fuzzy line of the law. That's why we have lawyers.