Who is Billie Eilish's brother, Finneas O'Connell?
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Billie Eilish: 27 facts about the Therefore I Am singer you probably never knew
8. Who is Billie Eilish's brother, Finneas O'Connell?
Billie Eilish’s older brother Finneas O’Connell is a famous musician and actor best known for his starring role as Alastair in Glee. Billie co-writes the majority of her music with Finneas and he produces it. [@billieeilish via Instagram]