The Forgotten Boy

Harry's twin brother is regarded as the Boy-Who-Lived. No one is aware of Harry, whose very existence has been forgotten, except by the Potter house elves. When Severus Snape finds out about Harry, he sees this as a chance to escape Dumbledore's control. Captivated by the little boy, he takes it upon himself to give Harry the father he needs. SS/HP father/son relationship.