In a white-box living room in an apartment on lower St. Charles Avenue here, the dining table was set for a family party: plastic bowls of chips, dip and salsa; a plastic bag of sepia-toned family photographs waiting to be opened; and a copy of Bliss Broyard’s new book, “One Drop: My Father’s Hidden Life — A Story of Race and Family Secrets.”

In town late last month for a publicity tour, Ms. Broyard, 41, grabbed and greeted cousins one after another as they came through the door. The gathering was at the temporary apartment of one cousin, Sheila Marie Prevost, 43, who lost her Upper Ninth Ward house and most of her possessions in Hurricane Katrina. Swing-era jazz filled the room. Ms. Broyard was guest of honor and auxiliary hostess. Read More