The way it works around here is that the trainee gets potty treats whenever he uses the potty and anyone else who happens to be about gets a treat or two as well. I refuse, however, to head back to the cupboards and dig out potty treats for a nine year old brother who wasn't there, but later saw the others with treats.
Not gunnu do it.
If you want the treats, you have to be there when I'm handing them out. As a result, I see some of the older ones circling the trainee and encouraging him to keep his pants dry by frequenting the candy machine--I mean potty.