Big B works with his grandchildren on promo film 
Actor Amitabh Bachchan and his grandchildren Navya Naveli Nanda and Agastya Nanda are working on a promotional film for his son-in-law Nikhil Nanda's company Escorts Limited. Sharing a picture with Navya and Agastya, Bachchan tweeted, "To Delhi in the morning to work at son in law's factory and to be with the apples of my heart... my grandchildren !!"