As currently divyadrishti came 2 know about both r sisters , in order 2 know about pischani they decided 2 hide their relationship coz they feel pischani is connected 2 Shergill family & someone from Shergill family is helping her.
Rakshit knows DRI is hiding something from him , + he also have a belief that DRI somehow gets 2 know about what is about 2 happen as before marriage in study when he manhandled DRI , he asked some questions from thou DRI gave believable answers, so currently he don't trust DRI fully.
Whenever DD being sister truth will be out , I feel Rakshit may feel betrayed that DD specially DRI kept fooling d whole family, bring repeatedly asked 4 kundali & birth date she lied 2 Mahima.
As Rakshit knows about pischani but in a different way as he thinks his father was having affair with pischani.
Maybe he may ask DD 2 leave shergill house , there will be a short seperation b/w drikshit
I guess maybe Mahima know Chiru , so whenever he re enter , he inform Rakshit about DD , guruji , Vidya , pischani & what happened 25 yrs before. Earlier I used 2 believe Mahima may know Vidya but I don't have much hope.
Pischani will definitely try 2 seperate DD & guruji's vanshaj , so she may bring DD truth in twisted manner where DD look like a culprits. Lavanya 2 will try 2 take advantage of d situation.
If DD gets 2 know that Shikhar is helping pischani they can't prove him guilty & without proof Rakshit will not believe them.
This is just assumptions from my side