How do you deal with a spirit that is hostile to one person in your household?

Well..there is this spirit\demon in my household.This spirit doesn't like my brother at all.But it presents no harm to the rest of the family.Because everytime i enter his room i sense that specific spirit in his room.Then it appeared in my little sister's and my room(that we share).When i sense it in my room its happy but in my brothers room its all mad.And i feel like crying along with pressure near my upper chest area.The spirit wears a black cape, it's also hunchback.The figure is a skeleton. Why does he hate my brother?Why do i feel like crying and feel pressure in mi upper chest area? PLEASE E-MAIL ME.