Article continues below advertisementKevin Federline revealed why their sons have pulled away from Britney Spears.During the Thursday, October 23, episode of "Piers Morgan Uncensored," the former backup dancer shared that their eldest son, Sean Preston Federline, 20, recently stopped wanting to see their mom after a troubling visit that left them "terrified" and "worried."Article continues below advertisement"[Britney] saw one of my sons one day this year, and he decided not to go back over there because of what he saw," he claimed.