When carrying out special treatment or examination for patients, the Informed Consent for Special Treatment/Examination should be signed, that is, the hospital has the obligation to inform. If the doctor didn't sign the consent form with his family, that is, he didn't fulfill his obligation to inform, then the hospital was at fault and hurt the patient, which constituted a medical accident. It is best to negotiate with the hospital first and try to mediate. There is really no way to go to court again.
I wish your old man a speedy recovery!