Kalyani's determination was really admirable. Yet she could have told more. She could have told she has sisterly love for him which is why she did all these. She could have told in an ideal world, every human being is brother or sister to each other. It will be good if they show, Kalyani maintains her sisterly love to Mohan. But that probably will not be the case. As far Mohan, again he showed common human nature thinking what she does is because of her kaadal to him. Still why is Mohan not able to realize his own sister Thulasi, has unconditional love for him? Same applies to Pavithra also. Mohan can be said to be completely reformed only when he shows he is good to Thulasi. Probably by then, Thulasi and MM will persuade Kalyani to love Mohan and she may give in to them. Of course, as some of you said Padma really needs a DIL like a capable Kalyani who could put her in place.