Hum Aapke Hai Koun!

Prem, a top student, is learning the ropes of business under his elder brother Rajesh and his uncle Kailashnath, a big industrialist. In another town, Nisha is studying computer science and is the darling of her elder sister, Pooja, and her parents, Professor Choudhry and Kamladevi. Fate brings the two families together and this results in the the betrothal of Rajesh and Pooja. At the wedding, Prem meets Nisha and falls in love with this carefree woman. With Pooja as the woman of the house, joy knows no bounds in Prem's family. Months pass by and Pooja becomes pregnant. Nisha is invited to come and stay with her sister and attend the traditional function before the child's birth. Nisha's arrival is like a dream come true for Prem. Nisha stays there until the birth of the child, taking over the household chores, and becoming very much a part of the family. In soft whispers, Prem and Nisha commit their love for each other and secretly dream of spending a lifetime together. Then fate strikes a cruel blow when Pooja dies after a sudden fall down a flight of stairs. Because of this tragedy, life in the house comes to a standstill. Rajesh worries about the future of his motherless child, and it causes his health to deteriorate. Nisha's father suggests that Nisha should get married to Rajesh and become the mother of Pooja's child. Prem and Nisha decide to sacrifice their love for the sake of the family. Fate intervenes once again when Rajesh comes to know the truth behind Prem and Nisha's sacrifice. Putting his child into Nisha's arms, Rajesh unites and blesses the two lovers, whose hearts long to belong together.

Hum (English: We/Us) is a 1991 Bollywood film directed by Mukul S. Anand. It stars Amitabh Bachchan, Rajnikant, Govinda, Kimi Katkar, Shilpa Shirodkar, Deepa Sahi and Danny Denzongpa. The film was a huge hit when released partly due to its use of the song Jumma Chumma which has become extremely popular to this day. However, the song was plagiarized from African musician Mory Kante's song "Tama Tama". This was the last successful film for Bachchan in the early 90s before he announced his temporary retirement immediately after the release of this film for five years. Rajnikanth, who stars in the film, later remade it in Tamil as Basha_(film).
Tiger (Amitabh Bachchan) works for the local Don Bhaktawar (Danny Denzongpa) but never hesitates to revolt against him if he harms his friends or family. When his girlfriend Jumma (Kimi Katkar)'s brother Gonsalves (Romesh Sharma) is killed by Bhakhtawar for revolting against him, Tiger promises revenge. However Tiger's father Pratap (Deepak Shirde) intervenes and is killed accidentally. When corrupt police officer Girdhar (Anupam Kher) finds out that Tiger is on the hunt for Bhakhtawar, he kills Bhakhtawar's family and frames Tiger. Bhakhtawar is arrested soon after learning of his family's death for countless murders and promises to avenge his family's death by killing Tiger when he returns. Tiger is forced to go on the run with his two half-brothers with his girlfriend Jumma who decides to stay behind so that Tiger can fully concentrate on looking after his brothers. Many years later, he is now known as Shekhar and is living a happy life with his two grown-up brothers Kumar (Rajnikant) and Vijay (Govinda) as well as Kumar's wife Aarti (Deepa Sahi) and a daughter, Jyoti. Bhakhtawar returns from jail and is on the hunt for Tiger/Shekhar. He asks many people about where Shekar is. When he finds Tiger/Shekar he kidnaps Jyoti and Aarti. Bhaktwar thinks that Shekar killed his family! Meanwhile, Shekar, Vijay and Kumar look for Aarti and Jyoti at a train station and Kumar sees Shekar beat up a man that was making fun of Jyoti and Aarti. He is very surprised!! Watch the movie to find the rest out!!!!

Source: Wikipedia