The Slytherin Law

Voldemort finds a loophole in the law. He is now a free man and the ministry can do absolutely nothing as he openly gathers forces. Oh, and he also wants to become Lord Slytherin. The only problem being that to claim the title you need a heir. One who can speak parsletongue. Luckily Slytherin made a law for a situation like this. A law that is in Voldemort's favour. OotP plz read