Conversation so far:
Where did Billy Corgan grow up?
Billy Corgan was born in Chicago's Lincoln Park neighborhood. After his father, William Corgan Sr. remarried, Corgan and his brother went to live with them in Glendale Heights, Illinois.
Where did Billy Corgan attend school?
Billy Corgan attended Glenbard North High School in Carol Stream, Illinois.
Did Billy Corgan attend college or did he just go out to start a career in music?
Despite grant and scholarship offers from a number of schools, and a tuition fund left by his grandmother, Billy Corgan decided to pursue music full-time.

Question: Was he the only child or did he have siblings?
Self-contained rewrite: Was Billy Corgan the only child or did he have siblings?