Marie Osmond was caught off-guard when CNN's Larry King asked her about her 16-year-old son's stint in rehab, and her brother Donny was so furious at King's questioin that he threatened to have the interview yanked from the news channel, the New York Post reported today (Friday). According to the newspaper, the usual softball-throwing questioner raised the embarrassing matter after becoming miffed with The Osmonds' decision to celebrate their 50 years in show biz on Oprah Winfrey's show instead of his. The Post noted that the father of King's wife Shawn is Marie Osmond's manager.