Supporting Lead (drama) - The Blind aka: Duck Dynasty Story as Yng Si Robertson. Grant Davidson plays teenage Uncle Si, sidekick to his brother, Phil Robertson, in The Blind. Long before Phil Robertson was a reality-TV star, he fell in love and started a family, but his demons threatened to tear their lives apart. The Blind is the true story that started a dynasty. Teen Si unknowingly provides levity during difficult times for his family.