It can't be Jiji the blackmailer, look she have the child of birjesh and tara. and before she escaped she said she will be back and will uses birjesh son against them to get revenge and that would be possible after 20 years leap and the son is not even a year or 2 years old.
if she is story is completely ruined she will go to jail or die but the mystery of birjesh child will remain unsolved. if she goes to jail who have the son