The moods will fluctuate especially since he has just been put on meds. When I was first diagnosed my mood was all over the map for about the first 6 months. I know it's hard for a person to watch this happen to a family member (my mom is diagnosed as well).

It may also help if he could go through a out-patient group therapy program. You can check with his Psychiatrist to see if there's one in his area. That was really helpful for me.