Snape has a daughter, Kat, and she is more of her mom then him, her eye color, her personality, her sense of curiosity, even the way she dresses. But one thing that makes him believe she is his daughter is her sense of life.

What would happen to Hogwarts when 3 sisters and a expelled boy come to Hogwarts. Will it survive when ther are all sorted in to Slytherin?