Dylan Efron is certain that his friend Justin Bieber will be pleased with his Dancing With the Stars tribute performance. What makes me respect Justin so much is he makes people feel comfortable being vulnerable,” Efron said in a confessional. Dylan and his older brother, actor Zac Efron, have two younger half-siblings. “My dad is super excited,” Dylan told Us ahead of the September premiere. She’s just like, ‘Where’d this come from?’ My brother is supportive.”According to Dylan, 37-year-old Zac told him what the show was like.