Mahal (1970)

Calcutta-based Rajesh Dixit lives a poor lifestyle along with his widowed mother, and sister, Chanda; is employed with a male named Shyam, and spends a lot of time gambling. He is upset when he finds Chanda has been seeing a male named Ramu, however, when he goes to confront the latter, he finds him to be his childhood friend, and ends up arranging their marriage. Unable to finance the wedding reception, he enters into a criminal conspiracy with Motilal to impersonate the nephew, Ravinath Sharma, of Darjeeling's Raja Dinanath. Rajesh re-locates there, convinces Dinanath that he is indeed his estranged nephew, then woos wealthy Roopa and hopes to wed her soon. But things do not exactly turn out as he had planned - for soon the police will be not only be made aware of his real id. but they will also have evidence that he has killed Dinanath.