Qayamat Se Qayamat Tak (movie, 1988)

Both Dhanraj Singh and Randhir Singh are two bitter and old time enemies. They faced a disastrous situation when their children, Raj and Rashmi fall deeply in love. They openly declare their hatred for one another and will do anything in their power, even kill - but they will not accept their children's choice. But Raj and Rashmi are dedicated to their love and are not willing to accept the fact that their fathers are mutual enemies.