Robert Irwin and Witney Carson chat with E’s Deidre Behar after their impressive ‘One Hit Wonders’ night performance on ‘Dancing With the Stars,’ airing Tuesdays on ABC and streaming on Hulu and Disney+. Robert shares what it means to have his big sister, Bindi, and mom, Terri, in the ballroom cheering him on; noticeably absent from Tuesday’s episode, though, was Bindi’s daughter, Robert’s niece, Grace, whom he calls a ‘good-luck charm.’ Robert explains why the 4-year-old won’t be at every taping, while praising his pro partner for becoming like family.