Finneas O'Connell recently scooped a load of Grammys for his production and songwriting roles on his sister Billie Eilish's album.
However, the 22-year-old (yes, he's still only 22) who Billie recently called 'her brother and best friend' is also a musician in his own right. He released his debut EP 'Blood Harmony' last October.
He made an appearance on Jimmy Fallon's show to discuss his songwriting and his music. Oh, and there was also the small matter of the siblings' collaboration on the forthcoming James Bond theme.
Although he claimed that he wasn't allowed to really discuss the song, he said that it was coming out 'really soon'. He also revealed that he had already seen 'No Time to Die' and it's 'great'.
He even throws in a comedy Irish accent for good measure, and performed his own song 'Let's Fall in Love for the Night'.
Watch the interview and his performance below: