Very interesting. You know the book I want to compare this to? Imaginary Girls. Not that the writing was anything near as haunting and lyrical, but because they both employ magic realism (though it's closer to fantasy here)(or maybe even SF - are those alternate universes, or what?) in a psychologically symbolic way, and both deal with uncomfortably intense family relationships. 
 This had some severely grotesque moments, and there's one scene that I want to say crossed a line for me, and yet I kept reading. Maybe it crossed the place where I self-consciously feel a line should have been, or where it once was and no longer is. Dunno. This is one I have to think about some more before reviewing fully. 
 And you know that for me, that's a GOOD thing. Thinky thinky thinky!