The 8-year-old started reading the “Harry Potter” books a few months ago; she’s finishing the last installment in the 30-45 minutes of extra awake time we give her after bath time.  Naturally, she wanted to dress like Hermione for Halloween this year.  So, we let her.  But what about the rest of us? Her two younger siblings were not all that excited about dressing like characters from a book and movie they knew nothing about. “There’s a cat in the book.” “A cat?” “Yes!  Hermione has a cat…