I'm not quite sure what led to them being chased or how Dad is linked. I like your writing style, but just be careful, sometimes leaving out words can make it difficult to follow who is doing what. I wasn't quite sure how to visualize the pedestrians. Are they in a zombie-like state?
At page 5 I was thinking this is pretty slow for Action, and then it just shifted into full on action. Just be careful of too much repetition. The cars bounce and jump a lot. There's also a lot of going fast, then having to slow for people, then fast and then slow again. This would be a pretty high budget short to make.