Petunia,
If this letter has reached you then I am dead. As much as you pretend to be ignorant of my world you know that we are at war, and you know that my family and I are in danger. I can safely say that if you are reading this, I have been murdered by what your husband, Vernon would call 'the opposition'. This is not a pointless letter to announce my death to you - I know neither of us would waste our time on that.
If I am dead you must sever all ties with me and my world. Do not contact James or Harry. I can't think of why you would, but in any case don't. Burn this letter and any others I have ever sent you. Pictures too, anything that connects you to me, because despite everything I want you to stay safe, and not let what I am ruin your life. I know you think it already has, but I'm trying to cut you out of my world out of kindness, and not out of spite. I call it my world, because you never let it be 'our world'. I wanted you to be included. It was what I wished for every year blowing out my birthday candles. It was so simple and I was naive enough then to believe if you wished for something enough it would come true. I don't want you in my world anymore, it's too dangerous, you wouldn't survive, your family wouldn't survive. Nothing muggle would.
I'm sorry for what came between us. I'm sorry for me being a witch. I'm sorry, really, for being a sister you were always ashamed of. I hated the fact that I felt embarrassed of who I was in front of you. I hate that you just couldn't accept that I was me, and that James was James, and witches and wizards were witches and wizards, and we just couldn't change that.
Saying that, I never considered how you must have felt. We spent our entire childhood reading fairytales about magic and I grew up living in that world and you didn't. I hope perhaps you get some comfort from the fact that my fairytale has ended and your life hasn't. Maybe not, maybe you will think it's justice. All good things must come to an end, that sort of thing.
I take back now all the terrible things and words I threw at you in these past years. Looking at all the times we fought, I can't believe that we didn't just put our differences aside. I feel so incredibly selfish now, writing this, imagining myself dead and you reading this, as I never gave a single seconds thought as to why you acted the way you did.
I know that if I survive and this never reaches you, when we next meet, if we next, meet, I will tell you some of this if I can, because you need to know all of this.
I hope the fighting never reaches you. If it does, and only if it does, then remember me. If you are at threat from my world, only then contact James and show him this letter. I know that despite how you feel about him, and how he feels about you, he will protect you to the death. Regardless of what you think of him he would die to save you, my sister, just because I would die to save you.
Again, I apologise. I wish you a happy life as the only child you always told me you wanted to be. In spite of everything, I love you so much.
Lily.