This is the last time I am going to comment on this thread, and I am only doing so because I've really had enough of the pompous, judgmental tone from certain techs here.
I know these people personally. The kid in question is very sweet and not really a problem, and it would appear a good portion of the issues that appeared on his computer likely happened because of his friends. Most kids have friends and some of them are more trouble than others. This is life. Even so, my general sense is these are just boys acting their age, and not with any particular maliciousness. The grandmother is very kind and brings down the hammer when necessary...however she is not tech-savvy and that is why she calls me for help. The solution I applied seems to be working just fine and I have not heard a peep since then.
I feel sorry for your customers if your first and last response to situations like this is "sorry, can't help you, you just suck at parenting." How charming. Honestly? This is why people call me after trying people like you.