The first thing you must know about this book: Scott Young adores his son. This adoration pours out in every mention of Neil, whether he's breeding chickens or playing Carnegie Hall. Whether the senior Young was quite so emotional about his other children or not, it's really touching.
The book is utterly unique, as far as I can tell: with the exception of A.A. Milne, fathers just don't seem to write biographies of their children, much less legendary newspapermen of exceedingly legendary rock stars. You do get the Neil Young story in this book, with most of the milestones carefully included, but it's far less interesting than the story of the Young family from its beginnings and its contortions and realignments over the years.
Don't pick this up because you think it will let you understand Neil Young -- even the most milquetoast of men is ultimately unfathomable to others, and NY's inner landscape is craggy and forbidding indeed -- but if you want an account of one family's life, go ahead!
It's appropriate to the man that the two worthwhile biographies (this, by Neil's father, and Shakey, by Jimmy McDonough) of Neil Young have extremely unreliable narrators. This isn't to say that either is intentionally deceptive or misleading, but both have such powerful feelings about Young that their books say more about who they see Neil as (Scott as the caring family man who wants simplicity, JMcD as a chronic deal-breaker and hellraiser) than who he actually is (somewhere in the boundary layer, I'd bet). It's something that Neil himself might well savor.