W.B.
Hi A.,
I agree with the other response and in addition to that, get the oatmeal bath that Aveeno makes it will really help with the itching.
As far as you other child, in my opinion I would say don't not let her get it and try not to let her get it. If she did get it at this point and they did have it together the likely hood of them getting it later in life are probably pretty slim. I would rather deal with 2 at one time then 2 at seperate times. Since she has already been exposed theres probably nothing you can do anyway, W.