Here's are few possiblilites to the track:
1. Nandini loses her baby, Tanya gives her baby to Nandini n later we have the whole who's the real mom in the leap!
2. Karan dies, both Tanya n Nandini have sons and they look like Hiten n we have double role of the boys, being step brothers and all.
3. Nandini dies in childbirth n Tanya brings up all three kids, bhoomi and other two and the suspense unfolds in the leap...what do u all think? Ekta can make up lot of junk!! š
Give your suggestion to the storyline?