This Boy's Life Narrator:

Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?

First-Person (Central Narrator)

 If you're writing an autobiography, this is the voice to use. You can't look at the events from anyone else's perspective but yours. More importantly, you're the hero of your own story, so you're going to be front and center for everything, no matter what happens. We see everything from Jack's point of view, and know only what he knows during the whole shebang. Sometimes he includes details that he learned later, like his father's Jewish heritage, which he "had to wait another ten years before learning." But even then, he takes time to tell us when he found out that information, so we don't get confused. Everything else is basically what he thinks while he's thinking it.