Part of what it took for my sister and I was that she finally researched bipolar, learned about it and called me to talk about it. When she understood more what I live with she understood me better. Oddly it took being more isolated (they lived in an extremely rural place 10 hours from family and friends for a year and a half) for her to realize having a sister is worthwhile and an illness doesn't mean I'm evil. I hope your brother finds something that helps him see the same about you and about people in general.