Karan is consider the "elder" son of the house currently, so in relation Nandani is the jethani.
Originally posted by: mizzdesi
I don't think the past should have anything to do with what Damini said she is talking about the present sure she made mistakes in the past but she has realized them and corrected them if you take a clear look Damini is Nandini jethani that relation gives her the right to correct Nandini if she is in the wrong and Nandini should keep her rudeness to herself and Karan and not involve Gautam who has done nothing to offend her therefore she herself involves Damini by showing rudeness to Gautam