I really like this! And you did a fantastic job! It's different from other stories I've read like this and that makes me like it even more! I love that you went right in with Zack's POV, and showed his emotions towards his parents perfectly. I can understand why he would be angry, and I love the amount of teenage angst you put into his feelings.
Plus, the summary drew me right in. I'm seriously wondering what is going to happen in this story!