Uncle getting assaulted and falsely accused of offence

My Uncle who helped and saved my 3rd no grand father who was beaten up brutally by his own son and his ally with 8 stiches on his body, has been falsely alleged and booked under section 354b. Two facts that my uncle is one of the very gentle persons I know in this world and second that he has not even seen that bitch in the last around 2 years. That lady whom he has not even seen in that long period is wife of that son who beaten up his father, has booked him up falsely under 354B. After around one week that grandfa was found dead and his body was immediately disposed off without letting us know. This belongs to Bihar. What can we do?? I have recording from an auto call recorder in which he said that I will break him up and then after 3-4 hours later he brutally beaten up his father whom my uncle saved and that is why he has been falsely booked under that section. This all was because grandfa was not passing the property to him. That late grandfa also booked him up for beating him up