Demons and Monsters (Remus Lupin's sister and niece)

When Remus Lupin was two years old, his parents had another baby: a beautiful baby girl by the name of Anella Grace. They shared a room, so when Remus was attacked at the age of five, Anella was in the room and was also attacked by Fenir Greyback, making her a full fledged werewolf. Anella and Remus went through the transitions together until Remus left Hogwarts. At this time, Anella fell in love. Or so she thought. She got married as soon as the two left Hogwarts and became pregnant. Fearful that her daughter would inherit her Lycanthropy, she sent her daughter and husband away. Little did she know, her love didn't change Damien. He was the same coldhearted, terrible person he was when he and Anella met. Anella's fear is met. Her daughter inherited the gene. So she grew up with her father chaining her in the basement, growing used to being referred to as "it" and "monster". So Sofianna runs away, to her mother. Anella is distraught, confused and scared. What if she hurt the little girl? Anella goes to the only person who might could help, or at least comfort her. Her older brother was everything to her. And when Remus must teach at Hogwarts, his little sister tags along.