thanks atina & netra for the updates!
its very easy to show nithi her true identity. by showing her photos, her id card etc... sundara should have brought it with him instead of them trying to brainwash her. if i were nithi, i will react the same too since i don't remember sundara/selva and shakti/gayathri has been the one who was kind to me.
another issue, im surprised when i read that karpagam blasted vikru, both baba & anu stand there helpless... now im speechless (can someone give her one big tight slap!)