Database: simpson_episodes
Question: What is the credited cast for the episode "In the Name of the Grandfather"?
SQL: SELECT DISTINCT T2.person FROM Episode AS T1 INNER JOIN Credit AS T2 ON T1.episode_id = T2.episode_id WHERE T1.title = 'In the Name of the Grandfather' AND T2.category = 'Cast' AND T2.credited = 'true';