Nri with crime

 First of all just apply for fresh summons to be sent to the accused person through the Indian Embassy at USA. Make an application under the provisions of Section 62 of the Code of Criminal Procedure 1973.Your brother in law can avail exemption from personal appearance and can conduct the case through his lawyer. He is not required to be present in Court. For petty matter like yours, extradition proceedings can not be initiated.

What are the possible consequences of this summon?

IF HE DOES NOT ATTEND YOU CA REQUEST COURT TO DECLARE HIM ABSOCONDER AND MOVE FOR ATTACHMENT OF HIS PROPERTY IN INDIA.

What if he doesnt come to Indai for the case?

IF HE IS PROCLAIMED ABSOCNDER CAN BE ARRESTED AT AIRPORT.  BUT YOU HVE TO WORK HARD FOR THIS.

What can be done if he comes to India , attends one hearing and rushes back to USA.

HE CAN SURE BACK IF THE BAIL IS GRANTED BY THE COURT AND IF THE COURT ALLWS HIM TO TRAVEL BACK.  OTHERWISE NOT.

He has applied for a green card in USA.

LET HIM EVEN GET A CITIZENSHIP THERE NOTHING CHANGES IN CRIMINA CASE IN INDIA

Mr Sudhir is quit correct, agreed