Conversation so far:
Was Ancestors a title of a song by George Gershwin?
What was George Gershwin's ancestry?
George Gershwin was of Russian Jewish and Lithuanian Jewish ancestry.
Did George Gershwin change his last name?
George Gershwin changed the spelling of his surname to 'Gershwin' around the time he became a professional musician.
Did George Gershwin have any siblings?
George Gershwin's siblings include Ira Gershwin, Arthur Gershwin, and Frances Gershwin.
Where did George Gershwin's family live?
George Gershwin's family lived in many different residences, as their father changed dwellings with each new enterprise he became involved in. They grew up mostly in the Yiddish Theater District.
Is there anything interesting about George Gershwin's ancestors?
George Gershwin's grandfather, Jakov Gershowitz, served for 25 years as a mechanic for the Imperial Russian Army to earn the right of free travel and residence as a Jew.

Question: What social class did his family belong to?
Self-contained rewrite: What social class did George Gershwin's family belong to?