Knowledge is power, chapter 5:
Each Year Severus Snape and Filius Flitwick had a bet. Whoever of the two got the most students sorted into their house won and the loser had the detentions of both Slytherin and Ravenclaw for the first two weeks of school. They sat together at the staff table keeping score eagerly during the sorting. No words were exchanged so neither would lose count.
The thing was almost over when the name was called. "WestCraven, Magritte."
Severus Snape was aware that his former school friends had a child, but somehow he'd almost forgotten. He tried not to think about Heather and Raislen Westcraven. Remembering painful points in his life only soured his mood more than it already was as a general rule and there were plenty of things to piss him off that were actually happening in the present or looming in the future. The past was pointless. As pointless as memories of old friends who'd made him care about them then stabbed him in the back when he didn't live his life the way they felt he should.
The girl looked enough like both of her parents to rattle him, though, and shake up old memories, not all of which were unpleasant, much to his annoyance. She had Heather's long red hair and tall willowy build with Raislen's face and large green eyes. Like both of her parents she expressed a love for books by reading one through the sorting and Albus's welcome speech. Unlike her parents she wasn't being at all social with anyone around her. In that way, she reminded Severus far more of himself.
It was no surprise that she was sorted into Slytherin. The owl on her chair was a bit odd, but it wasn't making trouble, so Severus decided not to either.