On Sunday, Casey Affleck won a Golden Globe for Best Performance by an Actor in a Motion Picture, Drama, for Manchester by the Sea. While the crowd in the room were collectively joyous, no one was prouder than his big brother Ben Affleck.

During the opening of his new film Live by Night, Ben caught up with Entertainment Tonight to share his pride.

“The overwhelming sense I had last night,” he said, “watching my brother win, and believing in him for so long and knowing how talented he is… it was the most memorable experience in my life. I’m thrilled. I wish him the best, but already what he’s done is amazing.”