“Just because something’s improbable doesn’t mean it’s impossible,” insists Dan Grunfeld, who has authored a powerful multigenerational saga that serves as proof. In “By the Grace of the Game: The Holocaust, a Basketball Legacy, and an Unprecedented American Dream,” the son of former NBA star and front-office executive Ernie Grunfeld shares the incredible story of his family’s journey from Auschwitz to New York City, the Olympics and pro basketball fame.