It's cute. I enjoyed the ending, it was quite surprising! It luckily saved the overly used plot. But the writing is VERY... amateurish. Example?
'"Can someone make me hot chocolate?" It was Alex, their younger brother. He had a faint scar over his left eyebrow, where he had run into a slide. His hair was tousled and messy. His sweatshirt was backwards. At least his socks matched. That was better than usual.'
It gives you a good example of what Alex is like but when I read this to myself/aloud, it sounded repetitive (he, he ,he, his, his, his) and their was little sentence variety.
A good read for those ten and under, but older children will be bothered by the monotonous structure/notice certain spots where stronger writing could be used- like I did.