For those wondering whether Shantanu-Natasha marriage is legal, here is a link on the Hindu Marriage act, from wikipedia.
http://en.wikipedia.org/wiki/Hindu_Marriage_Act
I will highlight just two main points, relevant for the storyline in RBO- Under the section 'Conditions':
The conditions of marriage are specified in Section 5 as follows: the Act expressively prohibits polygamy by stipulating that a Hindu marriage can be solemnized between two Hindus if neither party has a living spouse at the time of marriage;[2
]
Under the section 'Divorce', the law says:
A wife can also present a petition for the dissolution of marriage on if the husband marries again after the commencement of his first marriage....
So basically, Khanak does not have any right by law to give 'permission' to her husband to remarry. But she can file for divorce if Shantanu marries Natasha. Now in this case, since the divorce is what Agarwal, Natasha, SD and BD want, Khanak would not file for it (if the marriage happens). Ad that is the case with a lot of women in India, whose husbands go on to marry again. They do not want to divorce, nor do they have the courage to get the husband arrested, so they just put up with it. And mistakenly, people assume that the first wife has the right to grant permission for her husband to remarry....
Sorry for all this serious stuff:) But I really am fed up with this bigamy scenario happening again and again... really hope Swapna ji does not let us down...