Why did Carrère wait so long to visit? He asks himself this very question toward the end of his latest book, “Kolkhoz,” a conflicted family history that won the 2025 Prix Médicis. His mother, whose father was the son of a prominent Georgian intellectual and whose own mother was the daughter of a Russian aristocrat, never went at all—she had a fraught relationship with the success of Zourabichvili, whom she treated with “condescending affection.”