Hi
First of medical negligence has to be established .
If you believe there was a negligence so he died, do take an opinion from a different doctor who is not in any connections with the hospital.
Learn what was the procedure went wrong.
Did you complaint to the hospital. How do you conclude the failure and negligence in service.
The complaint can be fu led.in aconsumer forum against the hospital.
Show your treatment papers and get a legal opinion.
Your facts may be true but let the lawyer check if it is a fit case to proceed with .
If you are filing a complaint can ask.compensation for loss affection ,fincial loss, mental agony etc.