Have you ever watched My Cat From Hell with Jackson Galaxy?  That is the best show!  He goes around to homes who have cats that mishave and train their owners how to handle them.  The funny thing, most of the time, there is nothing wrong with cats!  It's all in the owner and how they handle and play with their cats.  You need to make your cats feel at home and give them toys and tall places to jump and play on.  A Pet Tree House is a perfect addition to any home.  It brings in a little of the outdoors in for your cats and gives them a place play, rest and just hang out.  Not only that, it looks great in your house!  If you haven't seen the show yet, please do.  You'll love it!