 Prior to Jared's appearance in the episode "The Con Man in the Meth Lab", Booth's long-time friend Dr. Camille Saroyan was the only one who knew about his childhood; in the same episode, Sweets observed the brothers and independently came to the conclusion himself that they were products of a physically abusive household.However, it is not until Season 5 when Booth's grandfather Hank is introduced that his abusive background is fully revealed.In Season 8 Booth bluntly tells Brennan that he "grew up in a household of violence and hatred", one of the few times the character has ever openly spoken of his past.