Renesmee's Twin Brother

Everyone knows Renesmee Cullen right? Well if you don't you liver under a rock. Well what if Renesmee has a younger twin who is hated by Edward, Bella and Renesmee, herself? Rosalie and Emmett adopted him and loved him like he was their own. So when Alice has a vision of the Volturi coming. Everyone spreads across the globe to find witnesses. When its time for the battle, Renesmee's twin stays with Emmett and Rosalie. Marcus notices the tie between the boy twin and Felix. He's shocked that they are both boys, and mates.