who is the dushman's dushman

who is ranveer and mamaji's dushman (kabir and aditi aka neha's) dushman? I hav an inkling it's the missing second son, abhinav.Let us see who does the role of abhinav?

i think it is iija ... 

Originally posted by: tinku007

i think it is iija ... 

big possibility,if kabir is iijaa's step son.

def  ija or kabir's sec bro

 Ranbeer & aditi...

if abhinav is shashank sharma...he's the murderer...