Severus Snape was born on January 9, 1960. He is the son of Eileen Prince, a witch and a muggle Tobias Snape. This is a witch-Blood, like Voldemort (whose father is a Muggle) or Harry Potter (whose maternal grandparents were Muggles). Certainly the young Severus was a victim of neglect of his parents. This neglect (associated with excessive violence of his father) helped lonely and unpleasant personality Rogue in adulthood.