Choti...Raj's Twin Sis. Why is she such a Snake?
Well though it does not justify her actions I can put up the base of her(the Choti Character's) very obvious hate.
1. Her parents disappointment on her arrival. It's obvious how they got disappointed she came in this world when they expected a boy.
2. Her importance diminished to zero when Raj arrived. I am very sure when she will be completely exposed she will stem out herself the root of the hatred.
3. Daddy Yadav's trust on her is her hardwork. I am very sure in childhood when she was constantly neglected of affection as most of the affection went to Raj she grew Competitive. But there's a catch, fortune is for boys not girls. That's when she left the competition with her father's trust and planned for her unborn boy.
4.But she has a girl instead of boy.Her hatred definitely increased with the thought that Raj's son would have a free pass and hence want to have a boy soon.
5. I don't think she likes her husband. Very sure they didn't care enough. If my daughter would have been ready for arrange marriage I would try to find the best groom for her. Her husband doesn't fit the picture where he would be easily chosen as a husband in an arranged marriage.
6. The other two sisters came way before Raj hence was never neglected and they got married but she came in this world with Raj and fell in a competition which she would never win. Her disappointment in her family might be a big cause why she doesn't like Raj.
When a hatred is directed to a certain person I don't think only being a heir to a big fortune can be a reason. There might be more of a big circumstances from childhood where she might be neglected of affection and also not getting a husband whom she would love. He might be rich but that doesn't stem away the competition she had been facing from childhood with Raj.
So this very heir theory doesn't come for any kind of fortune as her own husband is rich. It might be the jealousy and deprived affection from childhood and her competitive nature to garner affection of the family she had but never had as her own as the diamond of their eyes was Rajkumar Yadav.
She was the third daughter that no one wanted and the unwanted girl child that came in place of what they wanted. I bet even in their birthday which is the same date as they are twins the whole attention might be in Rajkumar in place of her.
He was precious whereas her an existence not worth to be much. She was expected to behave as a good sister as the other two who had already grown up and was married probably. But she was just nothing but a child in name.