I don't see anything funny about this. It seems like your father is suffering from paranoid delusions. You should really try to get him some help before things get really out of hand...not that they haven't already.

You should seriously pretend you do have a double life just to mess with him.

You never know who's the next Miley Cyrus.

Prove him wrong and ask him if he trusts you.

LOL!

Tell him you're living in a parallel universe as well. The one where he's sane.

Meet up with some friend he doesn't know and go home with them. Then, when you get home and he confronts you, tell him you don't know what he's talking about. ;)

You shouldn't have to prove anything. Your dad is going a little to far here.

I'd go find a family with a sense of humor and ask them to be your fake second family for a week to trick your dad

You should visit the most bizarre places around your town, sex shops, gay theatres and such. He'll never follow you again.