Amithab Bacchan's Father Harivansh Rai Bacchan married a Punjabi, Teji Singh. So Amitabh is 50% UP and 50% Punjabi. Amitabh then married the Bengali Jaya Bhaduri. So his son Abhisekh Bacchan is 50% Bengali, 25% UP and 25% Punjabi.
Abhisekh has married the South Indian Kannadiga Aishwarya Rai so their children will be 50% Kannadiga, 25% Bengali, 12.5% UP and 12.5% Punjabi.
So the Question to all is what happend if their children marries a ghati and their childern marry an Autralian caucasian blond?