Playing With Potions

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Numerous affluent families existed in the wizarding world, and the Malfoys were among them. Despite their desire for a sole heir, they welcomed a daughter, Isabelle, fifteen months before the birth of their son Draco.

Isabelle's dissimilarity to the Malfoys was striking - she neither resembled nor shared their beliefs and mannerisms.

This was because Isabelle was not entirely a Malfoy. Narcissa was her mother, but Lucius was not her biological father. Moreover, a particular serpent had assisted Narcissa in conceiving Isabelle.