Riley Keough, 31, is Hollywood royalty as the daughter of Lisa Marie Presley, 52, and granddaughter of the late Elvis Presley. Sadly, the talented actress — along with her mother Lisa Marie, grandmother Priscilla Presley, 75, and twin siblings Finley and Harper, 11 — are mourning her younger brother Benjamin who passed away at 27 years old. He died in Calabasas, CA, according to TMZ, “from a self-inflicted gunshot wound.”