I agree with Claritytoo. It is much better to bother the police and annoy your brother and/ or his alter needlessly than not do anything and then find out he or his alter has done the unthinkable. Seriously.
My big brother is gone. We'll never know if it was murder or suicide but we are forever haunted by the what ifs. What if we had called the police. What if we hadn't worried about making him mad
or scaring him? What if, what if, what if, what if . . .believe me , you don't want to be in our shoes asking what if.