View more photos of Silas Robertson Silas Robertson, aka Si, is Phils brother, best friend, and partner in crime. Si는 덕 다이너스티 TV 쇼뿐만 아니라 거의 모든 덕맨 DVD에서 볼 수 있습니다. Si has worked and hunted for Duck Commander since retiring from the United States Army in.