Wait I don't understand Rohan is Somani's son from his first marriage right, but looks too close to Vishaka to not be her real soon.
What about the little girl? She must be her own daughter so then why did she call Sameer step bro while Rohan 'real' bro? Vishaka said Sameer have met Rohan before but not that little girl so that means Vishaka gave birth to her. And if they are indeed her own children, then Vishaka should have brought them to Nanu's home whenever she came to Ahmedabad and also to Nanu's funeral.