The Dark Lord had killed Severus’ father when he had been seventeen, just before he had taken the mark. He had gone to a meeting covered in bruises his eye swollen shut and his lip split. Three days later his father was dead and Severus knew it was not a coincidence. The Dark Lord could not allow a muggle to hurt one of his chosen followers. Muggles like Severus’ father were too dangerous to be allowed to live.