At first this book reminded me of Carol Shields' "The Stone Diaries". The first section, the story of Davis and Margaret was written in a spare, even cold fashion. I never got a real feeling for their relationship. To me, it was detached and not terribly involving.
The book gained emotional momentum as it continued, to the point where the last section was like a full-blown "women's weepie", the sort of book that has gold-embossed covers and is a blockbuster family saga.
I like this book, but wouldn't place it in my canon of 'great books' because I don't think it had anything particularly profound or even original to say. Its examination of grief in the final section, and the relationship between parent and children is territory familiar to readers of Anita Shreve's 'The Pilot's Wife'. Why does everyone die so young? This is one of those books where the 'tragedies' are signalled right from the beginning, and where if happiness and contentment is a character's lot, then it will be snatched away very soon via death.
I also do not think that the cover blurb asserting it has so much to say about migration is true. Migration in this book is wholly linked with a personal need to place distance between oneself as an emerging adult and one's parents, or the milieu of one's parent/s. That is but one motivation for migration, and certainly debatable whether it is a majority motivation. Economic and political circumstances are never a factor, whereas I would suggest they are in 'real life'.
This book is unchallenging and undemanding, a 'good read' for a quiet weekend or a plane journey (unless you are prone to tears when characters die and don't want to cry in public!).