My 4 year old grandson has started taking money from my purse. He will let me know that he took only 4 dollars. When in fact, he may have taken 4 twenty dollar bills. Of course, he doesn't know the value of a dollar yet, but we are afraid that this is going to turn into something worse if we don't do the right thing now. Please help me with this situation, as I desperately need to help him understand that you can't just go into my purse & help yourself to my money!