If you're performing specifically for the kids (IE you are being employed to entertain children) then my advice to you would be to just drop the whole idea of using a mentalist based routine with them. Unless they're 12 or something, they just won't understand. You'll lose their attention, which means the parents (and more than likely - you) will have to deal with "itchy bottoms", crying, wandering off, shouting etc.
Trust me, as someone who worked for several years as a children's entertainer and now works as a mentalist, go out and buy some modelling balloons and leave the murder mystery themed routine for grown up bookings.
I say all this in the hope that you don't make the same mistakes that I made.
