Val Kilmer's Kids Mercedes and Jack on Their Dad's Legacy and Britney Spears Parallel (Exclusive)

The 61-year-old actor's upbringing and career are highlighted in the documentary, 'Val,' streaming on Amazon Prime Aug. 6. His kids, Mercedes and Jack, open up to ET about the biggest misconception of their dad and compare how the media has treated him over the years to how they treated Britney Spears.