The first time it happened, it seemed harmless. My mother-in-law, Delphina, was laughing at her friend Rosabel for not knowing what paprika was. I smiled, stirring the stew, cheeks burning — I didn’t know either. Later, when Rosabel left, Delphina turned to me: “You should know these things. You embarrass Darian when you don’t.” Her words stung. The next day,...