ok after watching the 26th video, I came up with two theory.
1-the raaz could be something like this. Bani is not a dixit. probably one day when Bani and her parents were walking down the park road(probably they lived there) Roshni and Jai were coming home from some party and they were half drunk. They got into an accident and killed Bani's parents. She became an orphan. Bani's current father used to work for Jai Walia, and Jai told him and Bani's is an orphan, so the father felt bad and adopted her.
2-now I am sure that Anu is pregnant. Because when Rano was asking her how can you be pregnant, the look on her face was not as if she was confused, she knows the answer. And she told Rano, that right now she can't open her mouth..........it's gotta be Rano! She wants to save the name of Walia kandan.
So do let me know what u guys think.😉