Looks like ishwari was blaming saurabh and sona and when dev came in he confirmed that he did it himself and no one forced him and that he saw that as a good investment. I am sure ishwari would have said bitter words about bose parvarish and how her son is all innicent and nobel.
So when dev confirma that he did it himself, ishwari would be sad (not sure why? . Does dev take ishus permission before he invests in new ventures ? May be he does who knows!! )
So now bijoy wanted to dance by chance and would have started saying look at your parvarish .. khot aapki parvarish mein hai humari nahi etc etc and dev being dev would have thrown his hand carelessly.. even thought that slap looked very intentional yo me.
Dev slapped bijoy - accidentally or not doesnt matter. One should mind his body parts when he is around babies or elders
So now sona is fuming and runa after bijoy and she will probably go to bose house eith them and dev follows and tries to apologize and say it was accident... i dont thinn bijoy will forgive him .. all in all after this whole incident i think sona will say she doesnt want to go through the treatments now - she may say there are too many problems and. She is not ready or may be she will just decline to take treatment even in future..
Now what will ishwari and dev do when sona says no to treatment is what we will have to watch