 The Mothers role was almost offered to Waheeda Rehman (qv). But  Yash Chopra had already cast her in Kabhi Kabhi as Amitabhs wife.  He was worried that if Kabhi Kabhi released first, the public may  not accept her as Amitabhs mother. Then Vyjayantimala was  approached, but Dr Bali (her husband) had reservations about his  wife playing a mother. Finally it was offered to Nirupa Roy.