Duck Dynasty's favorite Uncle, Si Robertson is Phil's brother, best friend, and partner in crime. He has a very specific job in the workshop, fashioning the reeds that are inserted in every patented duck call. It's a pretty easy job, made needlessly difficult by the fact that Si can never seem to stay on task. The Vietnam vet will often share his war stories with the guys, which usually gets the crew behind schedule, much to Willie's dismay. Si's most famous story is that while serving overseas, his mother sent him a blue mug. Thirty years later it's still hanging from his back pocket and he continues to only drink from this cup, every day.

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