"A woman who carries the baby for a couple. And it does not mean that the surrogate has sex with the father." She frowned, "You have three books on adoption and surrogacy in your library, look it up. They can change magical signatures, blood status, perhaps even a slight physical appearance, like an adopted Malfoy might gain gray eyes or blond hair. An adopted Weasley would most likely become ginger. It depends on ritual."