Dil Hai Tumhaara (movie, 2002)

Some twenty years ago Sarita promised to raise her husband's love child (Shalu) together with their own daughter (Nimmi). The girls grow up as the best of friends but Sarita has never been able to forgive Shalu her background. It doesn't make it better when she sees Shalu getting close to the man Nimmi is also in love with.