My brother's schizophrenic and just tonight he's suddenly gone all weird, he keeps saying that someone's going to get hurt and he's telling me to do weird things like opening the kitchen door and putting my shoes on.

He doesn't seem like himself at all and he has a history of hurting himself when he's having hallucinations. My parents are away in Spain for the weekend (we're 17) and I can't contact them. I can't drive us to the hospital, and anyway if he realized where we were going he would freak out.

Is it enough of an emergency to call an ambulance? Or should I call someone else (my aunt/grandparents)? They live pretty far away and I'm worried they'll take too long to get here and get us to the hospital.