karan loves someone else's child more then he loves his own child.. i mean bhumi is ansh and nandini's daughter .. and manthan is his own son with tanya . he may like bhumi more because she's nandini's daughter .. but bhumi isnt his blood daughter . karan has accepted that fact . but what about his own flesh and blood manthan? ..karan thinks lowly of manthan and used to yell at tanya for making manthan "bad" .. honestly, manthan's bad because his dad doesnt care much for him .. his dad just gave his anything he wants in a way that karan couldve felt giving manthan money will make him happy .. but manthan needs his father total love and care . im not saying karan hates manthan .. karan hasnt shown alot of love towards manthan .. i mean sure manthan is all bad and stuff but he stills needs a father . its probably karan's fault manthan is so rude .. it may be a way to get karan's attention ..