Sec 304-B and 498-A

Dear sir, please suggest me i was married one year ago and my wife 9 month pregnant but during the time of delivery my wife died due to amnoitic fluid embolism and doctor was declared it a natural death which is not in our hand but as per my father in law he was registered petition on court against me and my family members and they are demand money.doctors declared it is a natural death not murder so please dont be against at your relatives. My wife treatment was run starting 5 month in govt hospital and last 2.5 month in private hoslital(private hospital submitted by my law's not me i told him i m not rich and please all treatment done in govt hospital but they said no if u dont have the money to treated her daughter in private then we will take care but at the end month they are said please you treat your wife anywhere means in a govt hospital.my father in law said to police if we are take care my daughter in private then why he was gone in govt hospital it is negligence my son in law.but i truely said we both wife Family and my family agree to show my wife in vovt hospital.sir please let me know this case is valid or not and also one more thing magistrate also declared in his report this is not a dowry death because she died in the hand in govt doctor.