What s the name of this hindi classic movie?

The movie is not that old. Probably 80 s. I can t remember any casts; mostly they weren t that famous.

The plot is: A stubborn young prince gets exchanged somehow with his look-alike who is poor. While the poor one forgets about his mother getting so much wealth and fame, the rich one become attached with the poor one s mother and begin to lead a poor life. No one had any clue that they were exchanged.

That s all I remember. Can t remember the starting or ending.

I hope somebody could tell me the name.