This is a fantastic book: thought provoking, believable and ridiculously well written
It explores grief and love through expectations, where Ivan and Peter self consciously try to navigate live after the death of their father.
This is the best book I have read this year and one of the best I have read this decade.
Ps: if you find the first few chapters odd, persevere: it's like peep show, it couldn't have been done any other way