i feel your brother has liver problem but to make sure please consult the doctor for routine tests for liver damage
like Ultra sound
abdomen,liver function tests . if these tests are suggestive of chronic liver disesase, i am afraid it is not reversible.if your brother does not have jaundice
,abdominal distension then he requires neurologist
opinion.all this confusion can be avoided with above tests that advised.
hoping for the best outcome,bye