Stephen Baldwin and Carey Hart chat with ET's Deidre Behar about 'Special Forces: World's Toughest Test' season 3, premiering Jan. 8 on Fox. They open up about their families’ reactions to their decision to join the intense competition and share how day one was far more challenging than expected. Stephen also gives an update on becoming a grandfather for the second time after his daughter, Hailey Bieber, and her husband, Justin Bieber, welcomed their son, Jack Blues. Plus, Stephen reacts to 'The Flintstones in Viva Rock Vegas' turning 25 next year.