Different Parentage
A story in which a canonical character turns out to have a different parent (or parents) than we were told they had in canon. For example, they discover that they were adopted.
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Numbers Never Lie (Harry Potter) by Klynie
In her third year, Hermione's favorite class is Arithmancy. (A Snape is Hermione's Father story.)
Buffy Carter
Lilys Charm
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(1) Lily's Charm (Harry Potter) by Obsidian Embrace
In a story spanning two decades, Lily and Severus attempt to control the powers of the Dark Mark after Lily's life is threatened. Seventeen years later, Harry uncovers a long-buried truth about his parents.