In the scene, where Shantanu comes in front of PB family, it was interesting to watch, the reaction/interaction between Vaishali and Shantanu. Vaishali says, your parents must be real nice, to have given you such upbringing. To which, Shantanu, avoids eye contact with her, but passes her, and makes a remark, saying let us not talk about them, they did their work, by bringing me into the world, while I did bring myself up...............Then he walks upto Dadi and touches her feet, as a respectful gesture...........this scene to me, spoke volumes. I saw this only once, but it struck in my mind...............
I think Shantanu is SON of Vaishali............and her husband sr. Purohit.........I think, he is the brother of Dev.....If you notice, he did not touch Vaishali's feet. He had a cold feeling towards her..........It reminds me of Karan - Son of Queen Kunti. While Dev(legimitate son like Arjun), Shanatanu is like Karn......Queen Kunti could never give her name to Karn, because he was born before her wedding..............Karn and Arjun never liked each other ever...............Similarly Dev and Shantanu will clash in the coming days..........I think this whole story of Radha being his wife is sham....................There is no wife or anything............This is all plan of his big game plan, which even Mrin is not aware of....................He is trying to create web of deceit and lies......just like Chakravuh............and Vishaka like Duroydhan (who wanted Hastinapur at any cost) wants Dev and Purohit Bhavan at all cost........................Amma is like Shakuni, who constantly fills her mind with evil designs......................