Séraphine Cassandra Évreux is the youngest child of an entitled pair of pureblooded French aurors. Her mother, Maryse, originally hailed from French Guiana, and her father, Aurélien, grew up in his family manor outside of Paris. They met at Beauxbatons and discovered a mutual interest in auror-ing. And, well, it went from there.
As their children, Séverin and Séraphine, grew older, Maryse and Aurélien began to train them in the skills needed by aurors. By the time they got to school, they whizzed through the subjects like DAtDA, Transfiguration, Potions, and others that they had been taught at home.
In Séraphine's fifth year and her brother's sixth, they received owls from the ministry informing them of their parents' demise in the field. As Séra went into the custody of the seventeen-year-old Séverin, the siblings strengthened their resolve to become aurors, channeling their very real anger into their studies - and, later, their work.
Upon graduation, both siblings were snapped up by the French auror office within a month. There, they became close friends with Lucien Verlac and Kīlauea Vulgate, and formed a sort of group with them and a guy who had been in Séverin's year at Beauxbatons - Quentin Sébastien. Lucien, Kīlauea and Quentin now stay with the Évreux in their large Paris house, which has been dubbed "the institute".