000narr
Born in 1980, as the daughter of Sirius Black, Y/N wasn't too fortunate with her parents, never knowing her mother and having a basically absent father. In the first two years of her life, she was under the care of him though, and for all she could've remembered was that, he really tried hard for her to be there. But life seemed to go in the way in this case. After his imprisonment in 1982 for being accused of betraying the Potters and murdering twelve muggles, he let you in his only trustworthy family member's hands, his cousin, Andromeda Tonks.
She was the sister of Bellatrix Lestrange. Her family was close to Narcissa Malfoy's, both parents sharing a very important role in Voldemort's ideologies.
Andromeda and Sirius seemed to be the only one's not accepting their parents idea of being a pureblood. In result, both of them were excommunicated from their family.
Y/N was basically raised by Andromeda, being lucky to even have a sister 7 years older than her.
Y/N shares Andromeda's and her father's values when it came to their family and Voldemort ideologies, therefore being in a weird place mentally and morally when she starts getting comfortable with Draco Malfoy.
After giving it time and thought, she realises that you can have your own opinions and beliefs. Children do not have to step in their parents footsteps after all.