I don't think a blood sample is how DNA testing can be done. You need a tissue sample I think 😊
Rohit HAS to be the key. That and Myrah's video camera. I feel the video camera will get Rudra a tad suspicious and Rohit will spill. Maybe chachu will come into the picture too. They are the only two people of Myrah's backstory we will see and they will have to solve this mystery.
Having said that, yesterday when Rudra told Myrah, you don't have Paro's dil, I did think about the whole, she was an organ recipient or something.. and so she has Paro's heart, like literally 😆 Of course I am not a fan of that kind of plot either. But it could be a possibility.