I think, Madhav is Atharv's son. Because when the goons came Madhav said "Tumlogo ke liye to main hi kaafi hoon", didn't Atharv say something similar to this once? The logic by which it can proved that Madhav is Atharv's son is that: when Atharv took off all his clothes and got under the blanket. The next morning, after waking up, Vividha didn't react seeing herself without clothes. So, maybe they slept together that night. [I know it doesn't make 100% sense...but when did Hindi serials came sense?]
As we know that Raghav's wife is actually Guddi. And we also saw that she is prefnant and Chintu is also staying with them. So I assume that, Chintu might be the father of Guddi's child because they did have an affair before.
Another assumption... Ankit is supposed to go for an interview. I feel that Ankit will go for the interview to Raghav/Atharv's office. There he'll see Atharv and the drama will start.
What do you think??