1. First, Vinu should have some sense to recollect that first time he went to jail, it was because of Naveen-Avni mischief.
Secondly, Even now it is Avni who recommended the job for Vinu. Same day he joined the new job he was sent to Lucknow with money... Should he not have this basic sense to put this information together and pin-point on Naveen-Avni the moment they heard Rajvansh name?
2. Sadhana is aware of Naveen-Avni sending Vinu to jail first time.
Before she jumped into conclusion that Vasu was involved in this, she should have asked Vinu how he got this high paid job overnight. She did not have common sense to think that a person like Ranvir who is US educated faced difficulties finding a job that suit his qualifications, and had to settle for a small job. She actually believed Vinu was better than Ranvir that it did not occur to her that she should ask him how he managed such a high paid job?
What about NAveen-Avni? How could she give them such a clean chit? Just because he asked her forgiveness?? Vasu did not accept her so she remains in Sadhana's bad book? She is just ready to accept anything about Vasu and conveniently letting go of Naveen-Avni.
Is this a selfless act towards her mayka or bias towards her MIL? I am still debating....