You don’t know his name and roughly where he lives? That’s a sad situation. Hope he is ok. Fucked up parenting throwing him out for being gay. I really don’t know what to say here. Not much you can do I think, but to hope he’ll get online. If you have a mail from him, you could do a trace on his IP, and call that ISP and convince them to send a black and white to check him. Not likely, but it’s a possibility. In any case. His life decisions is his responsibility, but it’s good that he has someone who is worried about him. Maybe that’s something he needs to know.