patio11 is right: this is a question for your attorney.

For everyone else, this is a perfect example of an irony many entrepreneurs face today: some investors won't consider investing in a startup with only one founder, but co-founder relationships can create all sorts of problems that sour (or even kill) deals.

Mark Suster had some great advice about co-founders at a Startup Grind talk last month. http://youtu.be/oAHgGUFjK3c