As far as I remember,
Mohini is basically lying about her affair with Sahil and she is not pregnant with Sahil's child. She wanted to blackmail him since he found out that she was bad and basically married Harsh [Tulsi's son who is in the wheelchair] for money. Sahil and Ganga's relationship becomes strained as Ganga begins to believe Mohini. Sahil gets extremely frustrated and very lonely. However, he refuses to listen to Mohini. Thus, Mohini decides to hire Tripti who is Sahil's secretary to seduce him. Tripti does so successfully and Ganga comes to know about Tripti and Sahil's affair. She then leaves Sahil and Shanti Niketan for good. Eventually, Tripti and Sahil get married and she raises his two kids, Nakul and Lakshya to hate Ganga. Post-leap, Tripti's truth is revealed which shows that her marriage with Sahil is illegal since she was already married to Rishabh. Her plan was to get Sahil's money and then leave him.
Also, Nandini was in coma for a long time after giving birth to Bhoomi. Karan didn't even want to look at Bhoomi so Tanya took the responsibility of caring for her. Bhoomi began to believe Tanya was her real mother. Tulsi and the rest of the family then decided that Karan should marry Tanya so that Bhoomi could have a happy family. Basically, everyone had given up hope that Nandini would recover. Eventually she did, and after many problems, she decided to leave Karan and Tanya so they could be happy. Post leap, Karan is unable to forget Nandini which makes both him and Tanya miserable. Tanya resents Nandini for this along with Bhoomi and Manthan. Eventually, Bhoomi and Manthan come to know that Nandini is good and not trying to wreck their family. Thus, they side with her over Tanya. Then Tanya tries to commit suicide and ends up surviving but becomes blind. Now, she wants Karan/Nandini to be back together.
I hope that answers your question. I did a brief update so many details have been missed but I'm pretty sure you get the picture. =)
Edited by lilroses_89 - 17 years ago