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"Is that supposed to be a threat, Eileen?"
She smiled slowly and grimly. "It's a promise, darling."
When Severus returned home after his second year at Hogwarts, he discovered that his father no longer lived there. "He's run off," Mam said, "and good riddance to him."
He didn't question it, at least not aloud. However, he couldn't help but notice that the belladonna in the garden had been pulled up. When asked, none of the neighbours seemed to remember Tobias Snape very clearly at all.
In all fairness, Mam had warned Dad what would happen if he didn't stop drinking.