Now I do feel that Agastya and Surya obviously met after the accident and maybe Surya has given the zimmedari of looking after his family to Agastya.
Maybe Agastya did not know about Alka's bachha chory story and that's why he was shocked.
Rest apart today again we got hints that Surya is indeed Agastya when he called Imlie properly being angry.
. He was so worried ki woh uska bhanda phodegi. 
Anyway I liked the episode. But now that everyone knows that Surya is Agastya's twin brother, how will 'Surya' and Imlie get married now?
. Maybe they are planning to push all the weird things under the rug? 
I think Imlie will again try to leave the Chaudhury house seeing someone is there to look after the family members when 'Surya' will stop her again revealing his 'evil' intention for the Chaudhurys.