I'm not going to nark, but I'm a bit worried

My brother snuck out! I just arrived home.. 1am Sunday morning right now and his window is wide open. WOW. My brother snuck out? That's not like him. He would have argued about not being let out to Thirsty tonight.. a CHURCH event.. but its 1am?? He'll probably be with those new old friends of his.. oh goodnesss gracious I might go for a walk and look for him? There's a drunken party of young teens a couple of doors down.. This is so weird. I've locked him out.. I want to know when he's home.. That boooy. He's done ZERO study, has an exam on Monday I love my brother. More than anyone else in the whole wide world.