Billie Eilish’s brother Finneas co-writes and produces all of his sister’s songs, and she told fans at a recent concert that she'd quit music altogether if their collaborative relationship ever ended. “We make everything together, and, you know…if Finneas ever doesn’t want to make music with me, I just won’t make music anymore, for real,” she said between songs. “That would suck. Anyway, um… yeah, I just feel really grateful to have him on tour with me right now. I just owe everything to him, for real, in my life, and I love him very much and he’s my best friend in the world.”
But their relationship isn't perfect. Earlier this week Finneas posted an Instagram Story video of Billie farting in his face.