hi and welcome to HCM
I am sorry about your brother and his very serious disease. unfortunately stage 4 is inoperabile and this is one of the worst types of cancers which spreads fast to surrounding tissue,liver
and stomach. Obviously it infiltrated stomach and causes bleeding and obstruction,and pain as well. His therapy is palliative now. He can have blood transfusions and strong painkillers. Some surgical procedure such as gastrostomas may be performed but it is questionable would he survive it. Everything else isnt in your hands. Encourage him and be supportive. Prognosis is very bad,but try to make him easier to go through all this.Wish you good health.