1. Medical negligence has a two fold liability under the Indian law-civil and criminal. The doctors are liable to be prosecuted for negligence resulting in death which carries imprisonment up to two years on conviction, and they can also be sued for compensation.
2. To prove negligence it has to be shown that the death was the consequence of the lack of due care and attention on the part of the medical practitioner or the hospital, as the case may be, to find out whether rashness or negligence was involved.
3. If you have all the reports from the time of his admission to hospital till his death, the treatment given, the medicines injected, etc., take a second opinion from medical experts. If they confirm lack of due care then take a written statement from them and then avail your legal remedies