MARINA
Shortly after my first birthday my mother, whose name was Medea, murdered my brother. Of course, she didn't mean to do it. It was, in fact, the result of the milk going sour. When my mother went round to the corner store for milk she met someone. Or rather someone met her.
The muggle witness saw only the figure clad in black with a white mask walking away from the slightly dazed woman he recognized as a neighbour. Being a muggle, he surmised the figure was one of those damn teenagers dressing up and assaulting decent people on Halloween.
What happened when she got home was quiet. It lacked the usual flair of a death eater attack. My mother put the milk in the cold box, kissed my forehead and left me downstairs in the library. My twin brother Marcus, she picked up and took into the nursery.
There she preceded act out her part in the macabre affair.
My father has never told me exactly how my brother died. I can only assume that the event is too painful for him the want to recall. My mother's death he told me was due to the most perilous aspect of the imperious curse, the ability to just tell them to stop living, to still their heart and stop their breath with only a slight exertion of magic and will.
I don't think my father ever recovered from their deaths
Personally, I don't know what was worse for him. Knowing that they were dead, or not knowing who had killed them. No dark mark was raised over the bodies or the house. Just the frightened yells of a baby girl left for hours in the library alone.
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We must remain optimistic and know that all is not sorrow. The girl was found shortly after and taken away. She was raised both by her father and her Great Aunt. When he Great Aunt grew too old to take regular care of a small girl, she was placed in the care of her many different cousins. And so it was that she grew up under the influence of the beliefs of many, with no one force moulding her mind. This is perhaps the reason that the only belief universally impressed upon her was that there were people who were less able than herself.
When the time came for her to go to school, she did not go to Hogwarts. Rather, she traversed the frozen mountains of Eastern Europe to learn magic at Durmstrang. That is to say, until the Christmas of her fifteenth year when she hexed the balls off another student for unwelcome behaviour and the Headmistress and her father felt it would be best for all those concerned if she decided to finish her study in her native land.
At least, that was the public excuse. Her father was not quite so stupid as to ignore the signs of the rise of a dark lord. In the impending darkness, he drew what he had left close. The Azkaban breakout was also a factor, but Marina didn't find that out until The Prophet conveyed the story to the public.