It All Started With a Murder

Part 1

-1847-
My name is Amelie Henriette Agnes. Im the fourth descendant of Louise Alexandra. Thus, I have to bear the curse of my family. Murder, or be murdered.
My parents gave me up for adoption when I was an infant. I have never met them, and I would like to keep it that way. I don't know which one of my parents is the descendant of my great grandmother, Louise Alexandra, and I don't know which path did they chose. Did they murdered someone? Did they had been murdered? I would rather not think about it.
The only reason I knew about the course is that my biological parents had asked my step parents to give me a "letter" the moment I turned 18, which was yesterday. In the letter, they explained about the curse and they apologized that they chose to gave me up for adoption, they said they couldn't handle to tell this themselves, and they would't want me, their child, to see them murder someone or be murdered.
My step parents doesn't know about this, of course. They didn't open the letter. My mother and my father have been raising me with so much kindness. Of course, if I have to kill anyone, it wouldn't be them.
I was uncertain about this letter before. Is the curse really true? I asked my parents about Earl Nicholas Olbert.
"Oh Amelie, dear. We haven't even born yet the moment Earl Nicholas was killed. It was really strange, though. He was poisoned, my mother said. He died young, at the age of 31. It was quite shocking, my dear. I remember my mother, your grandmother, told me about that." My mother says.
"Was there any weird things happened during his last moment?" I ask.
"I don't know, my dear. Why do you ask?" Answer my mother.
"Oh, it's nothing, mother." I say quickly.
So, it is really true that Earl Nicholas Olbert was killed. But is the curse part really true?
"Amelie, dear. You are 18 now. Certainly you have to live on your own someday, get married, have children on your own. Don't you think you have to work somewhere? Save money from now, dear." My mother tell me.
"You are right, mother. In fact, I thing I know where can I get my first job."