It is an emotional father-son relationship with the ailment as the back-drop.Auro (Amitabh Bachchan) is an intelligent, witty 13 yr old boy with an extremely rare genetic defect that causes accelerated ageing. He suffers from a progeria like syndrome. Mentally he is 13, very normal, but physically he looks 5 times older. In spite of his condition, Auro is a very happy boy. He lives with his mother Vidya(Vidya Balan), who is a gynaecologist.Amol Arte (Abhishek Bachchan), is young, progressive and a full of ideals, politician. He is out to prove to the world that ''politics'' is not a bad word. He is a man with a mission. Auro is Amol''s son.It is a ''rare'' story about a father-son, son-father relationship