I read this aloud to my daughter, who really enjoys chapter books at bedtime. I was afraid she would be really upset about all the sadness in the book (we discussed that before we checked it out at the library). However, she wasn't nearly as upset as I was, as we read the sad parts. I think I spent 1/3 of the book in tears. ;) But I'm a sap ....
I would warn, though, that if you or your family hunts or supports hunting, this book will need some serious discussion during and after reading the book. The hunting and hunters mentioned in this book are presented in a very negative light, and as if the egregious behaviors described are what all hunters do. As someone who grew up hunting and in a hunting family, I realize that some hunters are this way - but most aren't. Obviously not everyone hunts, and certainly there are those who will disagree with me (and might seek this book out FOR that negative portrayal of hunters). However, if you are neutral or supportive of hunting, be aware of this subtext.
My daughter initiated the discussion by telling me that the hunter shouldn't have been on the family's property, trespassing; he should have asked permission if he wanted to hunt there. Then we talked about how dangerous and wrong it is for anyone to shoot at something unless they know for certain what it is (and that it's OK to shoot). Again, there are awful 'hunters' out there like that, but that her Grandpas and her aunts and uncles are not that way, and don't tolerate people who behave that way either.
Overall it's really well-written, and I enjoyed the character arcs, and my daughter enjoyed them too. I just wish the author hadn't been quite so heavy-handed with her personal opinions about hunting and hunters.