April, thank you for sharing with us. Unfortunately, I think your story is all too common. I am so sorry your life was so different from your half sister's.
About the Easter egg hunt: My family became witnesses when I was 4, but I have photos taken at my grandparent's house, where all the cousins are holding Easter baskets, full of colored eggs. I remember those egg hunts, running all over grandma's yard, and grandpa's garden, with my cousins and my brother looking under leaves, and how excited we were when we found the eggs. There was one color we had to find, to get a special prize. I found it one year. I must have only been three, but I remember. The prize was a chocolate bunny (small).
For some reason, that photo always made me so sad, because I realized how much we missed over the years. Shortly after the photo was taken, my grandparents and all but two of the cousin's families were witnesses, and there were no more Easter egg hunts.
So, I know how you feel about that memory.