HONOLULU, March 12 — To his high school classmates, Barack Obama was a pleasant if undistinguished student, the guy who seemed happiest on the basketball court, the first to dive into the pumpkin carving at Halloween, the one whose oratorical prowess was largely limited to out-debating classmates over the relative qualities of point guards. But Mr. Obama’s family here in Hawaii saw a more complex young man, a person whose racial confusion and feelings of alienation were matched with equal parts ambition, disquietude and lofty notions about where his internal struggles might lead. “There was always a joke between my...