Finneas Baird O'Connell, better known by his first name, Finneas, told Australia's The Project on Friday that his enterprising sibling decided to hold a yard sale while he was out of the house.

Well, yes - the Tiny Desk here at NPR headquarters. (SOUNDBITE OF TINY DESK CONCERT) BILLIE EILISH AND FINNEAS O'CONNELL: (Singing) Doing what's right without a reward. SHAPIRO: Billie Eilish and ...

Billie Eilish shared a video of the singer and her brother, Finneas O’Connell, workshopping an early version of their hit, “Birds of a Feather,” which features on her third studio album ...