When does stiles dad find out?

Stiles' dad, Sheriff Stilinski, finds out about the supernatural events and his son's involvement in them during Season 3 of "Teen Wolf." Specifically, he begins to piece things together in episodes like "The Overlooked." The full extent of the truth is revealed in later seasons as Stiles and his friends face increasingly dangerous threats. Sheriff Stilinski ultimately comes to understand the reality of the supernatural world his son is a part of.