Billie Eilish’s name was announced over and over again at the Grammys this year—after all, she won five awards—but anyone even passing familiar with the recent Vogue cover star’s music will have noticed the pop star’s constant companion at the ceremony: her brother and collaborator, FINNEAS, a.k.a. Finneas O'Connell. Together, they accepted a total of five awards, including record of the year, album of the year, and song of the year for their smash “Bad Guy.”

O’Connell has been cowriting and producing music for his sister for years, and joins her backing band on tour, but he’s also released plenty of music as a solo artist. One of O'Connell's singles, “Claudia,” was famously written for his girlfriend, YouTuber Claudia Sulewski, after the night they met. Music isn’t his only medium: O’Connell has also forayed into the acting world, with a role on Glee and cameos on Modern Family and Aquarius.

Vogue sat down with O’Connell as the Grammys dust settled to discuss his and Eilish’s unprecedented suite of wins, the pressures of awards season, and why celebrating after the ceremony was a little uncomfortable.

First things first, how did you and Billie celebrate after the Grammys?

We were forced to party, which I hate doing. If we’d lost, at least I wouldn’t have had to party.

I’m very sorry for your win.

Thank you.

What would you rather have done?

Anything. People say that, and really milk it as something that they brag about, but I would never do that. I just have no interest in being at a party.

Were you at all prepared for the possibility that you’d sweep the Grammys like you did?

No. Not for that possibility. We were hoping…between the two of us, we had 11 nominations, so we were brave enough to hope that maybe we’d get one. I would have been thrilled with that.

Is Billie the same, in terms of not wanting to party?

She was very grateful, obviously, and a lot of her friends were there. She has more “go with the flow” than I do, but we were both kind of embarrassed to win so much; you hope that it will be kind of equal, but after the third in a row…well, we love all of our fellow nominees.