After Dylan Efron didn’t honor brother Zac Efron by dancing to a High School Musical song for Disney Night on Dancing With the Stars, he promised he had something “special” planned for Dedication Night. That, it turns out, will be a dance with his younger sister, Olivia, to “Rewrite the Stars,” which Zac sang with Zendaya in the film The Greatest Showman.

Dylan and his pro partner, Daniella Karagach, have been sharing clips of themselves rehearsing with 5-year-old Olivia, sparking an interest in Dylan and Zac’s family. Scroll down for everything we know.