Isaac and Zac Hanson joined Gina J backstage at All-Star Christmas and talked the Wintry Mix Tour, new music for 2020,what it’s like to have a 40-person Thanksgiving holiday, and more. Plus, Zac and Isaac talk about whether their own kids– some of whom are in the same age range they were when “Mmmbop” came out– will continue in their dads’ musical footsteps.