The young brother -- Andrew, 9, Alexander, 7, and Tanner, 5 -- vanished from Morenci, Michigan, while celebrating Thanksgiving with their father John Skelton. The father has never been charged with murder in connection to the boys’ disappearance, but he is serving 10 to 15 years in prison after pleading no contest to unlawful imprisonment in Sept. 2011. Nancy Grace explores the latest in the case with Sandra Ali and Jeremy Allen, who are covering the Skelton brothers' case for Detroit's WDIV-TV, psychologist Caryn Stark, and Cold Case Research Institute director Sheryl McCollum.