Actor Samantha Akkineni took to Twitter on Monday and refer Nagarjuna Akkineni as ‘mama’ on late actor, his father Akkineni Nageswara Rao’s birth anniversary. Samantha continues to refer Nagarjuna as mama amid separation rumours with her husband Naga Chaitanya Akkineni. In July, Samantha changed the display name on her social media handles to S, dropping her surname Akkineni. However, the …