It has an interesting premise and good potential, but it doesn't take full advantage of what it has going for it and ruins it in the last 30 minutes of the movie. The ending is abupt and unsatisfactory, and there's not much of a takeaway. All in all, it was mostly enjoyable, and definitely not the worst movie I've ever seen.
However, I do want to say that Ally, the daughter, being deaf doesn't lend much to the story other than being an excuse for the whole family to know sign language. She also doesn't act deaf; even though she wasn't born deaf and lost her hearing in an accident, her behavior still wouldn't be so "normal" (read: like that of a hearing person). It would have made more sense if she was mute, whether selectively or because of the physical inability to speak. But hey, at least the signing was actually accurate and it wasn't just hearing actors making random hand movements.