Your brother is having hepatitis B infection that too active
Bed rest and plenty of fluid is okay
But he need a consultation with a gastroenterologist in a good hospital near by your residence for proper treatment in hospital
And everyone in family should have hepatitis B vaccine too if they have not taken before
Next Steps
Consultation with gastroenterologist and admission in good hospital till he is well enough
Health Tips
Vaccines to all family members if they have not taken before .