Who is the cast for the movie version?

Brother #1: Fez from That 70s show
Brother #2: Shaia LeBouef
Dad: Tony Shaloub from Monk
Crazy Uncle: The Soup Nazi from Seinfeld
Crazy Aunt: Susie Essman from Curb Your Enthusiasm
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I really wanted to go to that Bukake because I thought for sure that you were going to be on the receiving end. - Ryan Knox to Jeff Steward