CHENNAI: A few people apart from DMK president M. Karunanidhi's children call him `Appa' (father). One was an actress who shifted loyalties this week. Those close to Mr. Karunanidhi are fuming. Another young family member was of the opinion that there should be a ban on anyone calling Mr. Karunanidhi `Appa'. In all public interactions, M.K. Stalin refers to his father as `Thalaivar' (leader).