What episode does stile's dad find out about werewolves?

Stiles' dad, Sheriff Stilinski, discovers the truth about werewolves in Season 3, Episode 11, titled "Alpha." In this episode, Stiles and his friends confront the reality of the supernatural world, leading to a dramatic revelation for Sheriff Stilinski. The moment underscores the show's theme of secrets and the complexities of parental relationships in the face of extraordinary circumstances.