Um, ...how come you have valium and how come you gave some to your dad?
You have a bit of history here and I just don't have time to read it all, but I can hear your concern for your part in it, and you should have concern. Hey, your dad shouldn't have asked. Also, you shouldn't have provided it. Big no-no taking someone else's prescription. If it were valid, his doctor would have given it to him. Maybe he did but your dad used it all up? Not really bizarre behavior at all. At 72 he should be wiser. So should I, though I'm a decade behind him. Learn from him and be the wiser man is what I have to say.