The opening pages of Dan Grunfeld’s “By the Grace of the Game,” are difficult to read. The subtitle “The Holocaust, a Basketball Legacy, and an Unprecedented American Dream” gives some indication of the tragedy and sadness within the pages. A few chapters in, Grunfeld, the son of longtime NBA player and executive Ernie Grunfeld, spells out the atrocities: His paternal grandmother, Livia, who Dan calls Anyu, which translates to mother in her native Hungarian, lost both her parents and three siblings at Auschwitz and another of her sibling’s died in labor camp in Ukraine during World War II.