Shehzaade (1989)

After witnessing his parents' assassination by Thakur Hakim Singh, Laakhan Singh, and Roshan Singh; Captain Zorawar Singh from the Indian army takes shelter in Gauri's house and consumes an unreasonable amount of alcohol. In his inebriated state, he gets intimate with Gauri without realizing it and she gets pregnant; when her inspector brother finds out, he attempts to avenge the injustice done to his sister by attacking Zorawar, resulting in fisticuffs that leave the inspector dead. Meanwhile Gauri gives birth to a son and attempts to bring him up; she decides to name him Shankar Shrivastav and make him promise to take revenge on Zorawar. Years later, Shankar has grown up to be a police inspector and is on the lookout for Zorawar; he comes to the aid of a mechanic named Suraj Singh several times and befriends him, finding out that he owns a small garage and lives with his elderly mother Padmini in the Bombay slums. What Shankar does not know is that his friendship with Suraj will be short-lived: Suraj is the biological son of his enemy Zorawar, and Padmini is his wife.