Joshua’s grandmother calls with a mission: She’s dying, he’s a playwright, and it’s time for him to write about the family. She has one request: “Make it as bitter and vitriolic as possible.” Joshua Harmon casts his comic eye close to home in this sharp-tongued play about mothers and daughters, legacy and addiction, fierce cruelty and extraordinary love. The writer of two of Studio’s biggest hits (Bad Jews, Admissions) returns with a daringly personal play.