The Disney dynasty is banding together to thwart activist investors who want to infiltrate the company built by their grandfathers. Collectively, eight of the grandchildren signed a pair of letters to shareholders in which they defended the legacy of Disney founders Roy and Walt Disney, and voiced support for the current CEO Bob Iger. In their letters, the heirs of the Disney cofounders name-dropped billionaire Nelson Peltz among the activist investors that "must be defeated." "They haven't made any arguments for why they should be entrusted with the keys to the kingdom our family built," one letter said.