The bones in this title refer to the framework, the structure and strength that is family life and while a meditation on death, this book is more an affirmation of life and the strength that ordinary people have to heal, even from extraordinary tragedies.
While this book is an amazing work, it's NOT for everyone. People handle death and loss in different ways and some people will find that this book trivializes death and the afterlife. Others will find it a powerful allegory with a healing message.
I think that it's a bit like those scary but magical creatures that we see in the later Harry Potter movies that can only be seen by people who have seen death. There are truths in this world that few people will be able to see and/or understand without having experienced a tragedy first hand.
While I generally shy away from relentlessly sad books, I'd seen the movie that was made from this and found that there was a life affirming message that I wanted to read more of. As is almost always the case, the book has a slower pace and can examine in greater depth some things that a movie can only touch on.
While the movie that was made from this was very faithful to the spirit of the book, fans of the movie can still gleen some gold from the book that never made it into the film.
I think that subjects like this are healthy when absorbed in moderation. I sometimes wonder if there's an emotional equivelent of endorphines. They say that when you exercise and break down muscle, Endorphines are released and that the breakdown is necessary to gain greater strength. I'm wondering if some grief or trauma isn't necessary to gain wisdom and a book like this is the soul's equivelent of a work out.
Read it. Pondering the issues it raises will be good for you.