mom12
There are definatly opinions that allow daily showers for the 9 days for Non-contruction workers..
But it does show a bigger point, there is a different between Hashkafa and Halacha, and both you and WOW seem to want to make a stink over Hashkafa (Not to say hashkafa isnt important , it is, but sometimes you have to pick your battles)
Pick the battles over actual Halacha, not Hashkafa (at least for now)
if your son wants to take a shower daily, there is definatly room to allow it (Probably more than you realize)