A really nice touch in the book is that Tom had told Michael he'd tell him the Luca story "when you're a hundred." Then he heard it first hand, in Sicily no less, from the midwife Filomena. Her gratitude for Vito's intervention puts Luca's relationship with him in perspective--missing in the film.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.