k so this is my first talkie but here me out12 years ago prof snap married a muggle born and bc of his teaching carear decided it was best for him to divorce her so he did while little did he know his ex wife was prgnate with his child time skip 12 years later the lil girl shows up at hogwarts and is sorted into slytherian and she looks like prof snape and he notices and later In the story the lil girls singing and humming a song that sounds familiar that he cant quite place its his and his ex wifes special song.... btw the picture is u ur name is sage black your moms maden name