What can i do if my dad has stage 4 cirrhosis of the liver, how serious is this?

Extremely: Cirrhosis may reverse some if the cause can be removed or kept at bay. Otherwise, the only hope is liver transplantation. If the drinking is out of control, he's not a candidate. If there's another cause & he's alcohol-free, he hasa realistic hope for many more great years. Without definitive treatment, the outlook is usually very poor and management is only palliative.