Kody Brown and his wife, Robyn Brown, will not be on Season 21 of “Sister Wives.” The trailer for the TLC show’s upcoming installment dropped on Thursday, opening with a statement that “after 16 years of filming ‘Sister Wives,’ Kody & Robyn will not be returning to the show.” The duo — who didn’t appear in the teaser — did not comment on the bombshell news. Reps for Kody and TLC did not immediately respond to Page Six’s requests for comment. His ex-wives, however, appeared to react to the casting update during a series of confessionals. “I don’t know what it means. I have no idea,” Christine Brown Woolley said in the trailer. Janelle…
