Stage 2 heart failure, what does this mean?

My father was told he was in stage 2 heart failure, that his brain is starting to die, lungs not functioning right, kidneys not working right. He is on oxygen at home, his blood pressure has been 98/40 and lower, over weight, and type 2 sugar, staying in 280 and 320 what kind of chance does he have, and how long

The American College of Cardiology and American Heart Association developed a classification of heart failure based on stages of the syndrome.
Stage 1 includes patients at risk of developing heart failure but who have no structural heart disease at present. These include patients with hypertension, diabetes mellitus, coronary artery disease, use of cardiac toxins, and familial history of cardiomyopathy. Strategies to prevent ventricular remodeling, including ACE inhibitors in selected cases, are advised.
Stage 2 includes patients with structural heart disease but no symptoms. The use of ACE inhibitors and beta-blockers is recommended.
Stage 3 includes patients with structural heart disease and symptomatic heart failure. Diuretics, digoxin, and aldosterone antagonists may be added to ACE inhibitors and beta-blockers depending upon the severity of symptoms. Cardiac resynchronization therapy also may be considered in selected patients.
Stage 4 includes patients with severe refractory heart failure. Physicians are urged to consider either end-of-life care or high-tech therapies such as cardiac transplantation, based on individual cases.
Please note that I am not a medical professional.