Redraw of the family tree I posted and the backstory of them
Katherine Fled Cainhurst after her Brother Luther was knighted, the culmination of a bitter rivalry lasting their entire childhood it inadvertently lead to her discovering the truth of the castle and why they were so fiercely protective of the bloodline, she then made her way to a town meeting Emit a local blacksmith and falling in love eventually marrying him, she felt she was finally free of the ridged tradition she had lived under for so long.
Katherine became a seamstress enjoying working alongside her husband but when she was pregnant with Annette her brother found and cornered her with orders to either bring her back to Cainhurst or kill her if she refused. upon finding she had built a life for herself and was going to have a child he couldn't go through with it so he decided to take a lock of her hair back after an emotional farewell and on his return to the castle told them he had had to kill her.
Emit and Katherine raised Annette well never telling her of her heritage wanting to protect her, when she was old enough she started helping out with the family business she spent most her days sewing with her mother and enjoying the time they spent together, soon her father introduced her to regular customer Fredric who was studying to be a doctor and needed his suits tailored so he would look the part, she and Fredric eventually married having two daughters Elenore and Effie who could not be more different to each other.
as time went on Fredrics health worsened he had always been feeble it was one of the reasons he had studied medicine, eventually he became bedbound beginning a spiral of obsession trying to use his knowledge to cure himself, all his research lead him to a so called "miracle cure" a treatment by the name of blood ministration, he travelled to the city of Yhanarm signing his name away only thinking of being cured, it was successful he was overjoyed at being able to return to his former self again and he began to make up for the time he had lost with his family, he was not bothered by the duties that were now required of him but due to those and needing to be closer to the City for his treatment he brought his family to live with him there.
Annette began to notice changes in Fredric after he had become ill he had never raised his voice at her and the children or thrown things but now it had become a common occurrence, one fateful day after returning home from the market she found him hunched over rambling to himself as she approached she saw his face it was not that of her husband it was twisted into that of a beast, as she turned to run he caught her in an instant turning the room red, Effie and Elenore had hidden themselves as their father had rambled and demanded to see them tearing the house apart, not wanting to be near him in his state they hadn't heard their mother return until they heard her screams, Elenore peered out wanting to protect her younger sister upon seeing the carnage she tried to creep past her father as he began his feast to try to alert anyone she could but she was not quick enough the last thing she did was scream for her sister to run.
Effie after losing everything had decided to become a Hunter she was determined to prevent the scourge from doing the damage she had witnessed first hand.